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Did Greeks originate from north Africa?
No. I understand that this question is related to E-V13, found in the Balkan. E-V13 isn't a quantifier of Greek genetics, it is one of many Greek founding lineages.Haplogroup E1b1b may have arrived in Europe by two routes: through the Middle East/Levant and directly from North Africa.The oldest E-M78 in Africa has been found at Taforalt Morocco. The Max Planck Institute for Evolutionary Anthropology in Leipzig, have sequenced DNA from individuals from Morocco dating to approximately 15,000 years ago, as published in Science. This is the oldest nuclear DNA from Africa ever successfully analyzed.The Y-DNA of 4 males waa found in E1b1b1a1-M78. This haplogroup occurs most frequently in present-day North East African populations The closely related E1b1b1b (M-123) haplogroup has been reported for Epipaleo- lithic Natufians and Pre-Pottery Neolithic Levantines (“Levant_N”). Unsupervised genetic clustering also suggests a connection of Taforalt to the Near East.What we are learning now is that certainly NW Africa's was genetically/demographically connected to NE Africa and to West Asia even at the very beginning of the local Upper Paleolithic, demolishing quite apparently all the theories that linked it to European Upper Paleolithic (from which it got its "Ibero-Maurusian" name).Also this quote from the authors in the press release:“The Iberomaurusians lived before the Natufians, but they were not their direct ancestors: The Natufians lack DNA from Africa, Krause says. This suggests that both groups inherited their shared DNA from a larger population that lived in North Africa or the Middle East more than 15,000 years ago, the team reports today in Science”The population exhumed from the archaeological site of Taforalt in Morocco is a valuable source of information toward a better knowledge of the settlement of Northern Africa region and provides a revolutionary way to specify the origin of Ibero-Maurusian populations.I wouldnt consider these Taforalt samples as thé ancestors of modern E-M78 subclades carriers (V22, V12, V65) What we see by contrasting the map of inferred patterns or E1b1b-M81(the berber marker and dominant in north west Africa) expansion and this ancient Y-DNA data from Taforalt is that the main E-M78 expansion most likely was already done, considering its age( formed 19800 ybp, TMRCA 13400 ybp) that it could represent an expansion from older times, much as I2 seems to have expanded in Europe. This would allow for V65 ("from west Egypt to Morocco" per one decription of its geography) to have expanded from NW Africa, not necessarily from Taforalt though but somewhow related to it.According to the authors "Several lines of evidence suggest that E-M78 sub-haplogroups have been involved in trans-Mediterranean migrations (in)directly from Africa. E-M78 and E-V65 haplogroups are common in northern Africa, where they originated, while other clades(like E-V13) are observed almost exclusively in Mediterranean Europe, as opposed to central and eastern Europe and the Horn of Africa among somali males (E-V32)The oldest to date sample of E-V13 we have is from Later Neolithic Hungary (1 in Sopot culture and 1 in Lengyel, c. 4500 BC and the earliest known prehistoric sample, the couple from Epi-Cardial Spain (c. 5000 BC).E-V13 has also been found in a skeleton of Avelanner Cave in Catalonia dating from 5000BC (cardial culture)So we know for sure that E1b1b was present in southern Europe at least since the Early Neolithic. Nonetheless, the possibility of other migrations of E1b1b to southern Europe during the Mesolithic or Late Palaeolithic cannot be ruled out.Research shows that the ancestors of modern Greeks were( indeed )the Minoans and Mycenaeans, already inhabiting the Greek peninsula for the past 5000 years, since 3000bc.Minoan Boxing Boys, restored fresco from Thera (modern-day Santorini), c.1600 BC. Currently located at the National Archaeological Museum in Athens, Greece.The Fisherman fresco is from the 16th century BCE from the Akrotiri site in GreeceTheir ancestors moved into Greece during the neolithic and bronze age from Anatolia and before that from the Caucasus..Mycenaean Fresco wall painting of an elborately dressed women in a procession from the Tiryns, Greece 14th, 13th Century BC Cat No 5883 Athens Archaeological MuseumScientists have obtained and analyzed the genome of ancient Mycenaean people and found they are strongly related to modern Greeks. Around three-quarters of the Mycenaeans' and Minoans' ancestry originated in Anatolia, present-day Turkey. The remaining quarter can be traced back to the Caucasus, near modern-day Iran.The Minoan Civilization and its counterpart on the Greek Mainland, the Mycenaean Civilization, were Europe’s first literate societies and the cultural ancestors of later Classical Greece. However, the question of the origins of the Minoans and their relationship to the Mycenaeans has long puzzled researchers.The Mycenaeans, with their roots in mainland Greece, seem to have adopted much of the Minoan technology and culture, but it is not clear how they were related. “We wanted to determine if the people who made up the Minoan and Mycenaean populations were actually genetically distinct or not. How were they related to each other? Who were their ancestors? And how are modern Greeks related to them?” says Johannes Krause, director at the Max Planck Institute for the Science of Human History and one of the corresponding authors of the study.A paper from 2017 in Nature suggests that, rather than being recently arrived, advanced outsiders, the Minoans had deep roots in the Aegean. The primary ancestors of both the Minoans and Mycenaeans were populations from Neolithic Western Anatolia and Greece and the two groups were very closely related to each other, and to modern Greeks.“It is remarkable how persistent the ancestry of the first European farmers is in Greece and other parts of southern Europe, but this does not mean that the populations there were completely isolated. There were at least two additional migrations in the Aegean before the time of the Minoans and Mycenaeans and some additional admixture later. The Greeks have always been a ‘work in progress’ in which layers of migration through the ages added to, but did not erase the genetic heritage of the Bronze Age populations,” stated Iosif Lazaridis of Harvard Medical School, lead author of the study.Genetic origins of the Minoans and Mycenaeans“Minoans, Mycenaeans, and modern Greeks also had some ancestry related to the ancient people of the Caucasus, Armenia, and Iran. This finding suggests that some migration occurred in the Aegean and southwestern Anatolia from the further east after the time of the earliest farmers," according to lead author Iosif LazaridisA European population in Minoan Bronze Age CreteMinoan were genetically very similar to modern-day Europeans but distinct from Egyptian or Libyan populations.EV-13 marker is neolithic and came into Greece and the Balkans before the arrival of the Dorians and Myceneans. When the Greek speaking Dorian and Mycenean proto-Greeks arrived in Greece around 1500 BC they mixed with the indigenous E-V13 neolithic peoples and the percentage of neolithic E-V13 marker became reduced in the population. The Dorians and Myceneans who brought the Greek language into Greece were not E-V13 carriers.The proto-Greeks (Myceneans / Dorians) who brought the Greek language into Greece were R1a carriers. They mixed with the neolithic peoples / Pelasgians of Greece who were E-V13 carriers.Neolithic farmers spread all around Europe,they didn't just sit in one placePericic et al. (2005) give a 7.3 kya estimate for the expansion of E-M78α (almost perfectly equivalent to E-V13) for Southeastern European populations north of Greece. Due to their use of the 3.6x slower mutation rate, this figure needs to be converted to equivalent years. The Nea Nikomedeia time depth was estimated as 9.2kya by King et al. Therefore, the equivalent age for the Pericic et al. (2005) expansion is (7.3/9.2) * 149 generations or 118 generations (1,540-950BC). They note that STR variance is higher in Greece, Macedonia, and Apulia, all areas with well-known historical Greek connections.Tracing Past Human Male Movements in Northern/Eastern Africa and Western Eurasia: New Clues from Y-Chromosomal Haplogroups E-M78 and J-M12Cruciani et al. (2007) propose that E-V13 arrived in Europe from West Asia and underwent an expansion in Europe at 4-4.7 kya. This age is calculated using effective mutation rates that are 2.4 or 2.8 slower than the germline rate, which seems to suggest a Late Bronze Age or even later expansion with a rate closer to the germline one.The signature North African marker E-M78, dominant in Egypt with its subclade E-V22 descends from Eurasian Adam CT-M168 E-M78 is a Non_African genetic marker. (Hodgson et al 2014)E-M78 has a near eastern neolithic origin"Both the King et al. E-V13 data, as well as the diverse, mostly European Haplozone E-V13 agree in placing the expansion of this haplogroup squarely in the Aegean Bronze Age.Haplogroup E1b1b has been associated with the earliest development of Neolithic lifestyle and the advent of agriculture, which is so far believed to have arisen in the Fertile Crescent, but could have developed earlier in parts of North/North East Africa. Agriculture spread from the Near East to Europe, at first mostly ovicaprid and cattle herders. E1b1b men (accompanied by G2a, J and T men) appear to have been associated at least with the diffusion of Neolithic painted pottery from the Levant to the Balkans (Thessalian Neolithic), and with the Cardium Pottery culture (5000-1500 BCE) in the Western Mediterranean. The only concrete evidence for this at the moment is the presence of this E-V13 subclade, commonest in the southern Balkans today, at a 7000-year old Neolithic site in north-east Spain, which was tested by Lacan et al (2011).E-v13 marker is considered a Greek marker because it follows the foot-print of ancient Greek colonisation - wherever ancient Greeks colonised the ev-13 marker went with them. R1a is also proto Greek and was carried by the proto-Greeks (Dorians and Myceneans) into Greece when they migrated there. Modern Greek DNA is the most similar to Southern Italian DNA which makes sense since Southern Italy was heavily populated by “Greek” colonists from 900 BC.On genetic test Sicilians are very similar to Peloponnese Greeks, Greek islanders & South ItaliansDifferential Greek and northern African migrations to Sicily are supported by genetic evidence from the Y chromosomeCornelia Di Gaetano et al.AbstractThe presence or absence of genetic heterogeneity in Sicily has long been debated. Through the analysis of the variation of Y-chromosome lineages, using the combination of haplogroups and short tandem repeats from several areas of Sicily, we show that traces of genetic flows occurred in the island, due to ancient Greek colonization and to northern African contributions, are still visible on the basis of the distribution of some lineages. The genetic contribution of Greek chromosomes to the Sicilian gene pool is estimated to be about 37% whereas the contribution of North African populations is estimated to be around 6%.In particular, the presence of a modal haplotype coming from the southern Balkan Peninsula and of its one-step derivates associated to E3b1a2-V13, supports a common genetic heritage between Sicilians and Greeks. The estimate of Time to Most Recent Common Ancestor is about 2380 years before present, which broadly agrees with the archaeological traces of the Greek classic era. The Eastern and Western part of Sicily appear to be signNowly different by the chi2-analysis, although the extent of such differentiation is not very high according to an analysis of molecular variance. The presence of a high number of different haplogroups in the island makes its gene diversity to signNow about 0.9. The general heterogeneous composition of haplogroups in our Sicilian data is similar to the patterns observed in other major islands of the Mediterranean, reflecting the complex histories of settlements in Sicily.Differential Greek and northern African migrations to Sicily are supported by genetic evidence from the Y chromosomeSouthern Italians/Sicilians are partially Greek (Magna Graecia).An additional piece of evidence is Y-chromosome distribution in Calabria, a Southern Italian region with well-known Greek connections. According to Semino et al. (2004) [Am. J. Hum. Genet. 74:1023–1034, 2004], the Calabrian sample has an E-M78 frequency of 16.3%, whereas "Calabria 2" representing the "Albanian community of the Cosenza province" has only 5.9%. This is consistent with the idea that E-V13 in modern Albanians is to a great degree due to Greek founders (Epirotes or ancient colonists).Albanians also coalesce to Roman/Late Antique times, consistent with the idea that their high frequency of haplogroup E-V13 (which signNowes very high numbers in e.g. Kosovars) is not associated with high diversity. Founder effects in that time frame are the reason for the high frequency of E-V13 in them.Albanians are a mix of Bronze Age invaders of Yamnaya culture and Neolithic residents of Balkans.Cruciani 2007 also mentions some oddballs for the Greek maritime theory:- Slovaks: 8.33% E-V13- Hungarians: 9.43% E-V13No mention of Serbs but the Republic of Macedonia has as much E-V13 as mainland Greece (17%), while Albanians double that figure (32%).Slavomacedonians from the former Yugoslav Republic of Macedonia coalesce well into AD times, at around the time of the first Slavic arrivals in the Balkans. This suggests that E-V13 in them is the result of local founders at around that time who adopted the Slavic language. However, Pericic et al. (2005) report high (but unspecified) diversity of E-M78α in "Macedonia", so it is possible that a larger number of earlier inhabitants were absorbed.Finally the highest concentrations of E-V13 west of Sicily are among Atlantic Iberians (Portuguese, Asturians), where historical Greek colonization was zero. This confirms again some older flow of Neolithic or maybe Chalcolithic age. There are other significative ammounts of this clades in most unlikely places like Denmark (3%), Germany (4%). All that can only be explained with Neolithic founder effects or something of the like. Ukranians (strong in E-V13) may have affected Northern Europe genetically... but at a time when the Greek ethnicity did not yet exist as such.Conclusion. Based on these results Minoans and Mycenaeans were genetically highly similar but not identical and that modern Greeks descend from these populations. The Minoans and Mycenaeans descended mainly from early Neolithic farmers, likely migrating thousands of years prior to the Bronze Age from Anatolia, in what is today modern Turkey.“Minoans, Mycenaeans, and modern Greeks also had some ancestry related to the ancient people of the Caucasus, Armenia, and Iran. This finding suggests that some migration occurred in the Aegean and southwestern Anatolia from further east after the time of the earliest farmers,” said Lazaridis.While both Minoans and Mycenaeans had both “first farmer” and “eastern” genetic origins, Mycenaeans traced an additional minor component of their ancestry to ancient inhabitants of Eastern Europe and northern Eurasia. This type of so-called Ancient North Eurasian ancestry is one of the three ancestral populations of present-day Europeans, and is also found in modern Greeks. There was genetic continuity in the Aegean from the time of the first farmers to present-day Greece, but not in isolation. The peoples of the Greek mainland had some admixture with Ancient North Eurasians and peoples of the Eastern European steppe both before and after the time of the Minoans and Mycenaeans, which may provide the missing link between Greek speakers and their linguistic relatives elsewhere in Europe and Asia.
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What are the variants of the Boeing 747?
Google and Wikipedia are your friends…I’m your friend too, so let me describe the different variants of the Boeing 747 for you on Quora:747–100First flight: February 9, 1969Number built: 168We start with the first generation 747. The prototype aircraft was named City of Everett, and it took off from the Boeing Field in Washington for its maiden flight.The inaugural commercial 747 flight took place on January 22, 1970. The plane serving the flight was Clipper Victor, the 11th Jumbo Jet built.On August 2, 1970, this plane was involved in the first ever hijacking of a 747. Pan Am Flight 299 was hijacked en-route to San Juan with 379 people aboard.The hijacker had a gun and explosives, and he demanded the captain to fly the plane to Cuba. The captain complied with his order.Having been notified of the hijacking, Cuban Prime Minister Fidel Castro visited Jose Marti Airport to witness the landing of a 747—a plane he had never seen before.Castro was intrigued by the unprecedented size of the Jumbo Jet. When the captain disembarked the plane with the terrorist, Castro bombarded the captain with questions about the jet’s capabilities, seemingly forgetting that he had just endured the sheer terror of a hijack.Unfortunately, Clipper Victor would later be involved in the worst aviation accident ever. On March 27, 1977, while operating as Pan Am Flight 1736, the plane was struck by KLM Flight 4805 on a runway, resulting in 583 fatalities.The second Boeing 747 ever built was turned into a noodle restaurant after retiring from service. However, the restaurant failed and the plane was scrapped.747–100SRFirst flight: August 31, 1973Number built: 7When Japanese airlines requested a high-capacity, domestic version of the 747, Boeing launched the 747–100 Short-Range. This variant has lower fuel capacity, and higher payload allowance. This is the first airliner to be configured to carry more than 500 passengers. Japan Airlines’ 747–100SR can carry up to 550 passengers.As the –100SR was designed to perform twice as many flight cycles as the –100, Boeing had to strengthen its airframe and landing gear.A –100SR was involved in the deadliest single-aircraft aviation accident, when Japan Airlines Flight 123 crashed in 1985, killing 520 people.▲ The aircraft involved in the tragedy.747–100BFirst flight: June 20, 1979Number built: 9This variant borrowed the stronger fuselage and landing gear design from the 747–100SR. Compared to the 747–100, it has a greater fuel capacity and longer range. Boeing also offered new engine options.In 1996, an Ilyushin Il-76TD struck a Boeing 747–100B flying at about 14,000 feet, resulting in the most fatal mid-air collision in history.747–100B SRFirst flight: November 3, 1978Number built: 20The difference between this model and the regular 747–100SR is an increased maximum take-off weight.747–100B SR SUDFirst flight: February 26, 1986Number built: 2This model has the same features as the 747–100B SR, but with a Stretched Upper Deck that is around 7 meters longer, providing a 10% increase in capacity and allowing for more seats. This new upper deck also came with a pair of full-size emergency exit doors for faster evacuation.▲ This image depicts an actual 747–100, not a –300.747–100SFThe 747–100 Special Freighter is a 747–100 converted to carry cargo. A main-deck side cargo door and cargo loading mechanisms were added. The main deck was strengthened to accommodate the increased weight of the payload.If you look closely at the image below, you’ll be able to see three exit doors that are sealed off, and the side cargo door behind the wing.747SPFirst flight: July 4, 1975Number built: 45The 747 Special Performance is truly unique and quirky. It is derived from the 747–100, and it’s about 14.7 meters shorter than a regular 747. It also has one less pair of exit doors on the main deck.It has a stubby fuselage, a huge vertical stabiliser, four turbofan engines and two passenger decks. It just looks ludicrous, and wonderful.The following was stated in Boeing’s 1984 edition of “747 Airplane Characteristics — Airport Planning”:[The 747SP] can fly higher, faster and farther than any other wide-body aircraft, and as a result serves well on long-distance air routes that do not require the size of the standard 747.The 747SP apparently had a top speed of approximately Mach 0.92 (630 mph/ 1013 kmh).One plane was involved in a near-disaster. In February 1985, China Airlines Flight 6 plummeted 30,000 feet in under 2 and a half minutes, before the pilots were able to regain control and level their jet out at 9,600 feet. The flight landed safely.▲ Damage sustained by the plane’s empennageThe plane was repaired, but its wings were permanently bent upwards by 5 cm.747–200BFirst flight: October 11, 1970Number built: 225The “second-generation” 747 entered service in February 1971, just a year after the original model. It has more powerful engines, higher maximum take-off weight and longer range.The 747-200B denotes the “basic” passenger version.▲ The KLM 747–200B that collided with Clipper Victor on the runway747–200FFirst flight: Early 1972Number built: 73This is the first freighter version of the 747 to be manufactured by Boeing.Boeing stated that this plane has “virtually” the same cargo space as the 747–100SF.747–200CFirst flight: Early 1973Number built: 13Equipped with a nose cargo door, the 747–200 Convertible is capable of being quickly converted from a passenger aircraft to a cargo aircraft, and vice versa. It can also carry a mix of cargo and passengers.▲ There are passenger windows on the nose cargo door.An El Al Boeing 747–200C carried a record-breaking 1,087 passengers on a single flight during Operation Solomon in 1991 (figure excludes babies board on the flight).747–200MFirst flight: Late 1974Number built: 78Also known as the –200B Combi, this plane is functionally similar to the –200C. It was built with a passenger cabin in the front half of the plane, and a cargo compartment in the back half.This model does not have a nose cargo door. Instead, a left-side main-deck cargo door was implemented near the rear of the aircraft. Unlike the –200C, this model cannot be converted into an all-cargo configuration.747 (SUD)While Boeing built the 747–100B SR SUD from scratch, they offered the Stretched Upper Deck as a retrofit to the 747–100B, 747–100SR, 747–200B and 747–200M variants.These images show the SUD modification process:All 747s that were upgraded with the extended upper deck were designated as “SUD” models. For example, the “747–200B SUD”.▲ Top: An original KLM 747–200B | Bottom: The same plane with the SUD upgrade747–300First flight: October 5, 1982Number built: 56The 747–300 is the third-generation passenger 747, and it came with the stretched upper deck as standard. To reiterate, the upper deck was stretched to be about 7 meters longer than older, non-retrofitted 747s, and it came with a pair of full-size exit doors.Boeing gave customers the option for updated engines, or the same engines from the 747–200 models.While older 747 variants had spiral staircases connecting the two passenger decks, the 747–300 featured a new staircase design which occupied less space in the cabin, providing room for more seats.▲ Left: Spiral staircase on a 747–200B | Right: Staircase on the 747–300747–300MFirst flight: Late 1982Number built: 21As with the 747–200M, the updated –300M can carry passengers and freight on the main deck. It is also referred to as the 747–300 Combi.747–300SRFirst flight: Late 1987Number built: 4This plane was once again introduced for Japanese airlines. It has a capacity of 584 passengers.747–300SFBoeing didn’t produce a freighter version of the 747–300, but they initiated a modification program in May 2000 to turn the passenger variants into cargo planes.747–400First flight: April 29, 1988Number built: 442The fourth-generation 747 introduced numerous structural and technological advancements, providing greater efficiency. It has more range, more fuel tanks, longer wings, and new wingtips that increase fuel efficiency by 4%.More importantly, this model came equipped with a glass cockpit consisting of multifunctional digital screens, which supersede many analog instruments. More computerised flight control systems were implemented, eliminating the need for a flight engineer and largely reducing the amount of knobs, dials and switches.Additionally, the model came with new powerplants choices and a refreshed passenger cabin. With 442 planes constructed, the 747–400 is the most popular 747 model.Unsurprisingly, the 1000th 747 produced is a 747–400.▲ This plane was delivered to Singapore Airlines in October 1993.747–400FFirst flight: Late 1993Number built: 126The freighter version of the 747–400.Since an extended upper deck is redundant and adds weight to the aircraft, every 747–400F retained the same upper deck dimensions as the 747–200F.747–400MFirst flight: Mid 1989Number built: 61Otherwise known as the 747–400 Combi, this aircraft can haul passengers and cargo on the main deck. Compared to older Combi aircraft, this model came with enhanced fire protection systems.The 747th 747 was a –400M. It was delivered to Lufthansa in September 1989.747–400DFirst flight: Early 1991Number built: 19For their high-capacity, short-range 747–400, Boeing decided to drop the “SR” label in favour of a new name, the 747–400 Domestic.Yet again, this variant was produced for the Japanese market. Because it’s tailored for short-haul flights, no winglets were installed on newly-manufactured 747–400D. Boeing later offered the winglets as a retrofit.This airplane has a maximum capacity of 660 passengers in a single-class configuration.747–400ERFirst flight: July 2002Number built: 6The 747–400 Extended Range was launched with an option of one or two additional fuel tanks in the forward cargo bay. Structural modifications allowed for a higher maximum takeoff weight.▲ Qantas is the sole operator of the –400ERThe Boeing Signature Interior, which debuted on the Boeing 777, was installed on every 747–400ER.The 747–400ER is expected to be retired by 2020.747-400ERFFirst flight: September 2002Number built: 40This model can fly 525 kilometres farther than the standard 747–400F. Like the -400ER, this plane has a more robust structure, enabling higher maximum takeoff weight allowance.747-400BCFFirst flight: October 5, 2005Every 747–400 Boeing Converted Freighter was once a passenger 747–400. Boeing appoints contractors like HAECO and SIAEC to perform the conversion work.Like the –400F, it has a side main-deck door situated behind the wings.747–8IFirst flight: March 20, 2011Number built: 47 as of September 2018Initially named the 747 Advanced, the 747–8 Intercontinental was launched in 2005.This model was developed with technologies and design derived from the 787. For the first time, Boeing lengthened the 747’s airframe. As a result, the 747–8I is the longest 747, and the longest commercial aircraft to date.It is powered by GEnX engines, the same ones found on the 787.The 747–8I features a redesigned wing and raked wingtips inspired by the 787. To reduce weight and improve efficiency, parts of the wings are constructed using carbon-fibre composites.It comes with updated flight deck systems and avionics, along with the Boeing Sky Interior. Its passenger windows are 16% larger than those on the 747–400, but unlike the 787, the windows don’t dim electrically.747–8FFirst flight: February 8, 2010Number built: 82 as of September 2018This freighter aircraft shares many attributes with the 747–8I, including its record fuselage length. However, the dimensions of the upper deck remain identical to original 747.The two 747–8 models are 5.6 meters longer than older 747 models, and 20.3 meters longer than the 747SP. They were stretched in different areas to suit their purposes:DreamlifterFirst flight: September 9, 2006Number converted: 4The 747–400 Large Cargo Freighter, better known as the Dreamlifter, is an oversized cargo transporter. This colossal aircraft has three times the cargo capacity of a –400F. It was exclusively designed and used by Boeing to carry parts of the 787 Dreamliner from suppliers around the world to the assembly plant.Like the –400BCF, this airplane model was converted from passenger 747–400s.▲ This 747–400 is one of the 4 aircraft to be modified into Dreamlifters.The first Dreamlifter rolled out of the hangar in August 2006, and it wasn’t particularly sightly. Then-president of Boeing Commercial Airplanes, Scott Carson, was reportedly heard apologising to the designer of the 747, Joe Sutter, by saying:[Sorry] for what we did to your plane.VC-25AFirst flight: May 16, 1987Number built: 2Commonly mistaken as the “Air Force One”, the VC-25A is a heavily modified version of the 747–200B. It’s only known as Air Force One when the POTUS is on board.In recent years, it has made many cameo appearances in tabloid newspapers.VC-25BFirst flight: July 8, 2016 (as a 747–8I)Number to be converted: 2The VC-25B will supplant the ageing VC-25A. It should be operational by 2024.To keep costs low, the US Air Force purchased two 747–8I airplanes that were originally built for a Russian airline which went bankrupt.▲ The two undelivered 747s destined to be VC-25Bs, stored in the Mojave desert747 SupertankerFirst flight: February 19, 2004Number converted: 3This is a Boeing 747 variant that was transformed into an aerial firefighting air tanker. It can carry up to 74,000 litres of fire retardant or water, and holds the record for the largest firefighting aircraft.Three Supertankers were built from a 747–100, –200C and –400BCF. However, only two entered service. This image below shows the 747–100 Supertanker:Presently, only the 747–400BCF Supertanker is in service.▲ This passenger plane was first converted into a freighter, then an air tanker.SOFIAFirst flight: April 26, 2007The Stratospheric Observatory for Infrared Astronomy is a heavily retrofitted 747SP. It has a telescope installed near the rear of the airframe, and flies at up to 45,000 feet during its missions.This 747SP was formerly owned by Pan Am, and subsequently United.▲ SOFIA, before make-up▲ SOFIA, after make-upBoeing YAL-1First flight: July 18, 2002This plane was once a 747–400F, before becoming the YAL-1 Airborne Laser. It has an infrared chemical laser mounted on its nose, which was intended to destroy tactical ballistic missiles.▲ This plane gives Rudolph a run for its moneyThe plane successfully destroyed two test missiles. However, it was expensive and not operationally feasible. Hence, it was scrapped in 2014.Boeing E-4First flight: June 13, 1973Number built: 4The E-4 is an airborne strategic command and control post. It is derived from the 747–200B. When in operation, the E-4 is identified as a “National Airborne Operations Center”.This plane is capable of aerial refuelling, and was designed to remain airborne for a week during an emergency.▲ This 747 variant has a hump on top of its hump, which houses an antenna.There are two versions of the model, the E-4A and E-4B. The US Air Force initially had three E-4A planes. In 1979, Boeing delivered a new E-4, with upgraded equipment, which was designated as the E-4B. Thereafter, the E-4A jets were refurbished to become E-4B models.Shuttle Carrier AircraftFirst flight with a space shuttle: February 18, 1977Number converted: 2The Shuttle Carrier Aircraft was designed to transport space shuttles from landing sites back to the launch complex. In 1974, an American Airlines 747–100 was acquired by NASA and turned into the SCA.During the maiden flight with an orbiter, Enterprise, the SCA signNowed a speed of 462 km/h (287 mph), and an altitude of 16,000 feet.In 1988, a 747–100SR was obtained from Japan Airlines and converted into a second SCA.▲ The SCA piggybacking Space Shuttle Enterprise▲ Space Shuttle Endeavour riding on the SCAAfter the conclusion of the space shuttle program, the Shuttle Carrier Aircraft carried the shuttles from the Kennedy Space Centre to various museums.Thereafter, the SCA were sourced for spare parts that could be reused on SOFIA. Both planes are now preserved at museums.▲ The 747–100 SCA on display at Space Center HoustonJumbohostelFirst night: January 15, 2009This 747–200B was transformed into a hostel.After some additional work, the engine nacelles were turned into small rooms.Let’s move on to some 747 variants that were conceptualised but never built.747 trijetPeriod of study: Late 1960s — Early 1970sBoeing engineers crafted a concept for a 747 trijet to compete with the DC-10 and L-1011, but they realised it was too costly to develop. Boeing engineers figured that making a three-engine version of the 747 would require a redesign of the wings and the vertical stabiliser, along with other hassles that made the concept uneconomical.So, Boeing scrapped the 747 trijet.747–500X/ –600X/ –700XAnnounced: September 2, 1996Boeing proposed three versions of the 747 with longer fuselages as potential competitors to the hypothetical A3XX plane, which would later become the A380.The concept models were to feature an improved wing design taken from the Boeing 777, more landing gear wheels and a new interior design.▲ 747–400 (Top) compared to the 500X and 600XThe 747–600X and –700X were planned to receive longer and wider fuselages, while retaining the existing wing dimensions and landing gear structures. Furthermore, Boeing stated that the –700X would potentially have a capacity of 650 passengers in a typical three-class configuration.The –500X and –600X were offered for sale at the 1996 Farnborough Airshow, but they didn’t receive any orders. Thereafter, Boeing axed these three models.Oh and one last variant…747–8 PSPImagined: October 18, 2018The Boeing 747–8 Photoshopped Special Performance is the chubbiest 747 ever.Thanks for viewing.// //If you’re interested to know how the worst aviation accident in history happened, and learn about other mid-air disasters, check out Isaac Low's answer to Have planes crashed into each other?Image sources1st — General Aviation News2nd — Aviation Safety Network3rd — The Pan Am Historical Foundation4th — Vecamspot5th — SOBIFY6th — Wikimedia Commons7th — National Geographic8th — Wikimedia Commons9th — Dennis HKG/Flickr10th — Wikimedia Commons11th — Wikimedia Commons12th — Wikimedia Commons13th — Airliners[.]net14th — Cargo Facts15th — NACOE16th — Airline Reporter17th — Top: Airport-Data[.]com | Bottom: Bureau of Aircraft Accidents Archives18th — Airlines Inform19th — Left: Sam Chui | Right: Airliners[.]net20th — Airplane-Pictures[.]net21st — Wikimedia Commons22nd — Rohan Patel/Flickr23rd — Wikimedia Commons24th — Air Charter25th — (Thumbnail of YouTube video by akino33 Aviation Video Channel)26th — Wikimedia Commons27th — Airliners[.]net28th — Airplane-Pictures[.]net29th — Wikimedia Commons30th — Wikimedia Commons31st — Wired32nd — Modern Airliners33rd — Wikimedia Commons34th — australianaviation[.]com[.]au35th — JetPhotos36th — indicator[.]gr37th — unilad[.]co[.]uk38th — Defense One39th — Planespotters[.]net40th — The Gazette41st — Wikimedia Commons42nd — Wikimedia Commons43rd — SOFIA Science Centre44th — Wikimedia Commons45th — Wikimedia Commons46th — Wikimedia Commons47th — NASA48th — Wikimedia Commons49th — Amusing Planet50th — Hostelworld[.]com51st — robertcatanescu[.]wordpress[.]com52nd — Simple Flying53rd — Boeing Images54th — Wikimedia Commons (photo edited by me)Note: Due to Quora’s policy, I cannot add the image URL sources in my answer. To view the image links, click here.
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Are Berbers pre-Roman peoples, or did they migrate to North Africa after the Romans?
No. The Amazigh, the descendants of the Iberomaurusians are the indigenous people of North Africa who carry indigenous markers belonging to North Africa like E—M81 and mtdna u6 yet near eastern in origin and did not migrate after the Romans into Africa.Iberomaurusian culture have appeared since the Last Glacial Maximum c. 25,000 years BP until the early Holocene c. 11,000 years cal BP.See for more detailsRita Maria Bargash's answer to Why do North Africans look brown?North Africans are the result of several back migrations between 35.000 and 12.000 years ago from the near east and therefor Eurasian in origin.North Africans, the Amazigh and Egyptians carry the same amount of neanderthal admixture as non Africans more specific West Asians and Europeans and its not due to recent near eastern nor european migrations.E1b1b M81 is a berber marker. It matters not who has it today It originated among the Berber people in North Africa."North African-specific lineage E-M81 is frequent in Berber-speaking groups(Herrera et al,; Dec 2014)"The distribution of E-M81 haplogroup, a Berber marker " (2010 Ambrosio et al)"E-M81 is thought to have originated in the area of North Africa during the Neolithic period about 14200 years ago (www.yfull.com/tree/E-M81). This haplogroup, referred to as a genetic Berber marker, signNowes a mean frequency of 42% in North Africa, with a decreasing gradient ranging from 98.1% in the southern and Berber regions of Morocco to 11.7% in the north of Egypt. In the Middle East, this Berber marker was reported in 1.3% of Lebanese, 5% among Sephardic Jews, and 3.7% of Turkish, but it was absent in Arab countries. In Europe, E-M81 haplogroup, widespread but rare, was found relatively higher in southern countries particularly in Spain and Portugal with the highest frequency found in Cantabria at 18.6%. This haplogroup signNowes a mean frequency of 42% in North Africa, decreasing in frequency from approximately 80% or more in some Moroccan Berber populations, including Saharawis, to approximately 10% to the east of this range in Egypt. it is sometimes referred to as a genetic "Berber marker*"Both E-M81 &E-M78 originated in North Africa”E-M81(The berber marker) and E-M78(Egyptian marker)descend from the same genetic twig (E-M35) they are indeed genetically the closest to each other. Plus E-m78 is hardly found in north west Africa and vice versa.East Africa has downstream mutations of E-M78. HENCE: "Y chromosome data are also suggestive of at least two episodes of non-African migration into the HOA prior to 3 ka. First, HOA populations carry E-M78 Y chromosomes at high frequencies. E-M78 dominant in northeastern Africa(The Nile basin) has a descendant lineage (E-V32) unique to the HOA that arrived by at least 6 ka”“The most probable origin of the proto-U6 lineage was the Near East. Around 30,000 years ago it spread to North Africa where it represents a signature of regional continuity… Attested presence of Caucasian people in northern Africa goes up to Paleolithic times… Linguistic research suggests that the Afroasiatic phylum of languages could have originated and extended with these Caucasians... " (“Mitochondrial DNA transit between West Asia and North Africa inferred from U6 phylogeography” Nicole Maca-Meyer, Ana M González, José Pestano, Carlos Flores, José M Larruga, Vicente M Cabrera; 2003)North Africans were among the first to colonize the Canary Islands: Study of ancient DNA shows the complexity of human migrations in North African prehistoryGenetic tests on the Canary Islanders show that their native ancestors were pure North African Berbers. They were almost completely isolated, were pagan and never conquered or converted by muslims or christians until the 15th centuryNatives surrendering after a battle with the Spaniards.Natives taken to the court of king Ferdinand and queen Isabella of Spain.On the origin of Iberomaurusians: new data based on ancient mitochondrial DNA and phylogenetic analysis of Afalou and Taforalt populationsOn the origin of Iberomaurusians: new data based on ancient mitochondrial DNA and phylogenetic analysis of Afalou and Taforalt populations.Mechta-Afalou hunter model - Stock Image - C014/6147“The body shape of the terminal Pleistocene Jebel Sahaba population is tropical‐adapted, with elongated limbs, especially in the distal segments, and is most similar to living sub‐Saharan Africans and less similar to late Pleistocene and Holocene North Africans (including Egyptians and Nubians). The sample's body shape likely reflects elevated gene flow up the Nile Valley from areas further south, but may also be due in part to the tropical hot conditions present at the site, even during glacial periods. The Jebel Sahaba sample are distinct in body shape from penecontemporary humans from Afalou‐Bou‐Rhummel (Algeria) and El Wad Natufians from the southern Levant—a result consistent with the results of both Irish (2000, 2005) using dental data and Franciscus (1995, 2003) using nasal data."The ancestors of the Amazigh were known as the libyans, after the Goddess Libya by the ancient GreekThese results clearly indicate the genetic continuity from later stone age (Taforalt 15000 years old) until at least Early Neolithic (IAM 7000 years old)Quote from the study“Interestingly, both haplogroups U6 and M1 have been observed in Taforalt. The presence in IAM of two prominent North African autochthonous lineages such as U6 and M1 supports maternal continuity in the area since Later Stone Age times and implies a Eurasian origin for Taforalt and IAM people.”https://www.pnas.org/content/pna...So to answer this question, the Amazigh are much much older than the “Romans” and still in place.
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Many modern digital producers rave about the SSL sound (the Solid State Logic sound) and recommend it for mixing and mastering d
Historical Context of the SSL.A signNow amount of music that has enriched our lives has passed through an SSL console of one type or another. The seriously big boys of mixing, Bob Clearmountain, Chris Lord-Alge, Tom Lord-Alge, Andy Wallace, Mark "Spike" Stent, Will Schillinger and Alan Moulder, engineers who have shaped the way we hear and appreciate modern music, often use SSL technology, specifically the 4000 series.The discographies of each mixer read as a who’s who of modern music. Andy Wallace alone has mixed some of the most seminal rock and heavy metal music in history - ...
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What are the best features of Microsoft Office 365?
Here’s a breakdown of some awesome Features Office 3651. Work Smarter, EverywhereAfter buying Office 365, you also gain access to its accompanying mobile apps and browser apps. This allows you to access their cloud service from any up to date web browser on your desktop or mobile device. Even better yet, you don’t have to install Office software on your computer to do this.The mobile app allows you to access all of your Office 365 subscriptions and Office products right from your smartphone or tablet; this includes Word, Excel, Powerpoint, Onenote, and more. Cut the cord and stop working on your PC only — download the Microsoft Office 365 mobile app to stay productive, even while on the go.2. Enjoy 50 GB of StorageEach Office 365 user receives a whopping 50 GB of storage with Exchange Online; this can be used to save emails, calendar events, task lists, meeting notes, contact information, and email attachments.You can save some more space in your mailbox by utilizing the OneDrive cloud storage feature to share attachments.Your OneDrive storage is also synced to your device, enabling you to work offline on files. As soon as you reconnect to the web, the newest versions of your documents will be automatically uploaded to your cloud storage. The new versions of your documents will also be sent to any other connected device, including your phone or tablet — nifty!3. Edit Documents with Real-Time Co-AuthoringCollaborate online and see changes your team makes to shared documents within your Office apps as they happen with the real-time co-authoring feature in Word. Save your file to OneDrive cloud storage or SharePoint so your team can access the document and make any necessary edits or updates. You can also share it directly from Word by utilizing a handily integrated sidebar. As the publisher and access-giver, you can edit accessibility settings at any time.With the improved version control that was rolled out with Office 2016 co-authoring, you can see which changes to the document were made by which contributor and when the update was made. You can also easily revert back to a previous version of the file whenever you need to.4. Connect with Co-WorkersYou may not have known this, but Office apps include a Skype in-app integration. You can use this feature to instant message your teammates, share your screen during meetings and have audio or visual conversations — without even exiting the Office apps you’re working in. You can continue Skype conversations even after you close your office apps via your desktop or mobile version of Skype. The best part? Your team will receive unlimited Skype minutes.Source: Microsoft5. Send Links, Not FilesIt’s time to move away from email attachments. It’s never been easier to share documents for co-authoring!Simply upload your file to Office 365’s cloud storage. Then, write your email via Outlook or the Outlook web app. Rather than attaching your document to the email, you can insert a link to the file on your cloud. Outlook will automatically allow email recipients to edit the document you wish to share. You can always change permissions on any document at your convenience.6. Convert OneNote Items into Outlook Calendar EventsEasily configure OneNote items to tasks within your Outlook calendar. You can also assign tasks to colleagues, complete with follow-up reminders and concise due dates. You can also transfer meeting notes taken in OneNote via email to your teammates, and add important details (date, location, and attendees) to their respective meeting.7. Use Your Mouse as a Laser Pointer during PowerPoint PresentationsWith only a simple keyboard shortcut (Ctrl + P), your mouse can be used as a laser pointer during your PowerPoint presentations. You can also use the “presenter mode” commands while using this feature.The laser pointer tool has been a nifty trick within older versions of the office apps for years; however, it was only recently integrated for touch-screen devices. All you have to do is hold down on your device’s screen, and the laser pointer will appear.8. Create a Power Map Using ExcelTurn data into a 3-D interactive map with Power Map, one of the many Power BI-enhanced data visualization features that Excel has to offer. It comes with three different filters: List, Range, or Advanced. The Power Map will help you not only convey your data more effectively, but also support your claims by creating a tangible story from the numbers.
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What are the main areas that one should learn during CA articleship?
I did my articleship from Khimji Kunverji and Co., one of the top firms in Mumbai; and it was an awesome experience. Let me shed some light on my learnings -Learn to say NO - Random seniors come and give you random work. Learn to say No. Learn to say you are busy. You are not a dustbin.Learn to say YES - You need to have a good rapport with your immediate seniors and your boss. I have filled my boss’s daughter’s BFM admission form because she needed some help. Sometimes, you have to keep your ego aside and look at the larger picture.Whether audit or tax is the one for you - You tend to spend 3 years in articleship, doing either audit or tax. It is good enough time to gauge whether you want to do this for your entire life or not. For me the answer was NO, and I switched to Finance. No point wasting time once you qualify.Domain Knowledge - In your first job interviews after becoming a CA, a lot of stress will be on what you did during these 3 years. You should be upto date with that. Get your basics right.Out time is a myth – As per my firm HR Manual, the official work time was roughly 10-30 to 6–30. Strangely, you used to be penalized for coming late, but no credit for going late. It’s the norm. Get used to it.Make Mistakes - Ask stupid questions. Make mistakes. Experiment. Because you have the license to. You are a fresher. As a CA, people expect more.Do not neglect your Social Life - Its important. Your boss will not come at 12 to your place with a cake in his hand, wishing you a happy birthday.I remember getting into a train during my 1st year articleship. I somehow started chatting with a guy standing near me. He was a CA. I told him I just cleared IPCC and started with articleship. He started laughing and said “Welcome to Hell”.With all the office and study pressure, you might feel life sucks during articleship, but it will be a great experience. You will create memories of a lifetime. Cherish it :)
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What kind of skill set should a CA student develop before starting Articleship?
This hunger for more knowledge is good for a CA Student. It is a very good idea to know what others have learnt and re-assess oneself on the basis of same, so that you become equally competent. This is a good way of improving oneself.Part A - About the core Knowledge:(a) What your firm operates in - you can't do much beyond that.Core Knowledge = Practical Knowledge about areas your firm is operating in.See the firm you have chosen or you got into, basically will provide you with the knowledge of some of the fields in which Chartered Accountants works. You cannot gain knowledge about all fields in which Chartered Accountants work, since the scope is very wide and whether it is a Big Four or a sole proprietor Chartered Accountant, nobody can give you work experience in all fields. So basically these core areas where you get to work - you have to be satisfied with the same. All you can do is - learn from experiences of your friends who are in to different core areas. This is a rigid area, and not much can be done in this.(b) Try to get an assignment in all kinds of activities that your firms do -You can't go out of the box in which your firm operates, but atleast you can learn everything that is in your box. Many articles run away from certain things - saying it is a low category assignment or not so fascinating. It is because they all hear it from their friends about the big industry they worked in and blah blah things. But go and ask those friends, if they know, what is the procedure to obtain a PAN card and a duplicate PAN card? What is the procedure to obtain Shop Act? or atleast if they know what is Shop act?My Insights -In our office they didn't used to allow articles to do that, the administrative people like Bcom people used to do that. But I insisted on the same, to allow me to do them once. The task was easy, but it was something very basic that I learnt. Later when you start your practice or job, these are somethings that give you edge over others. If you become an entrepreneur, you can handle those things yourself. So it is beneficial always.(c) Try to get assignments in all kinds of industries that firm works in -Basically most Chartered Accountants work in some fixed industries since when you do good to one client, similar clients get attracted, so automatically, you will see that most clients are of similar category. As an article you should try to do audit of all kinds of organizations -Based on organization type like Sole proprietor, Private limited companies, Partnership firms, trusts, public limited companies etc.Based on different business forms like Retailers, Wholesalers, Chain stores, Manufacturers, Service providers, Traders, Consultants, Support Services, Maintenance services, Export oriented, etc.Based on different industries like IT, E-commerce, FMCG, Finance, Automobiles, Telecom, etc.Based on Tax benefits or special act companies like religious trusts enjoying benefits u/s 11 or 12, regulated companies like insurance, banking, etc. or may be companies in Special Economic Zones, etc.A Piece of Advice -You won't find all of the above in any one firm. Such firms giving such wide opportunities don't exist. But thing is - you need to explore every corner of your own firm, whatever it is.(d) Try to gain overall knowledge of all types of works -Don't think about specialization in Articleship, it is not that much useful, because if later in life that sector goes down, your career will get a full-stop. As a Chartered Accountant you must first learn all the basics of all types of work, when you become aware about basics, i.e. after articleship, then you should try to develop core competence when you find jobs or do practice.My Insights -If you don't get an assignment of different type - go to your principal and say that "Sir, I want to learn about that kind of work, if next time there is any work related to that xyz client, please give me a chance." I did it in my articleship, and I got those opportunities, Sir was happier indeed, that an article was ready to take up some sort of responsibility. I am pretty sure, 80% of Chartered Accountants would do the same. If you say politely, the teacher inside them will awake, and they will allow you to fly!Part B - Other things that you should learn during articleship - More important than above said things!(a) Office Ethics -You should learn about the office culture, how people dress, talk, meet and greet colleagues, seniors and clients. It is very important to observe how people form groups, how they make their juniors to work and seniors to help/guide. It is very important to notice, how others are keeping good relations with administrative staff i.e. HR, Clerks, etc. - something that is very helpful at times of problems. There are many more things - basically you have to learn how people operate in office and especially how your boss stays in office - since someday you too will be a boss.A Piece of advice -Learn good things only. Although I assume most Chartered Accountants are well cultured and natured, but exceptions may exist. But remember, may be your boss was good or bad, you have to become a good boss in future.At many times you feel that your boss did wrong, and he/she should have allowed you to do xyz thing. Remember such incidents or make a note of it. When you become a boss, you do them correctly. If you are able to do, you are a good boss, else you will realize had a wrong idea about your boss.(b) Printing, Scanning, Documenting, Letter typing, Organizing Office, Using appropriate Stationery -Your reaction - "Oh God! Really?"Consider this situation - you are in a corporate office, a high ranked employee. You tell the clerk to scan a document, but your clerk is new. He is not acquainted with the printer. What would you do, if you yourself don't know how to use a printer or scanner? In early days of your job or in many companies, you don't have clerks who do it for you, you have a printer next to you and you have to do it yourself. In case you don't know these, what a shame! A Chartered Accountant, but does know how to use a printer or how to unpin a staple! God! Dummies on earth.My Insights -One of the expert HR was sharing his experiences with interviewing Chartered Accountant, at a conference that I was listening to. He said, we tried an experiment successfully. We told every candidate entering into the interview room to arrange certain documents and properly organize them into a file. Now on the basis of how file was organized, they discovered candidates who had done dummy articleship or articleship of low grade, because those candidates never knew how to arrange a file, since they never did it in their lifetime.So basically the best thing about a good leader, boss, a senior or an entrepreneur is that he/she knows the work of all persons junior to him/her very well. That's why they can handle them well.So basically learn the following things and many more which I can't list out -How to properly document an Audit file?How to properly keep a permanent client record - both electronic & physicalHow printers, scanners, servers of your office, internet network, LAN systems, routers, biometrics, connections etc. work in your office.How to use correct stationery correctly? Like properly unpinning documents, or may be how to create sets for clients, income tax officers, registrars etc.How to draft covering letters, envelopes, request letters, etc.(c) Drafting Email Communications & Email Ethics -The most important part indeed of articleship. The fact is we never get opportunity to learn this anywhere else. This is a good ground to learn. Initially you can see how your boss writes email, how your senior does it. Then you can innovate it yourself. The thing is in business world, everything today goes on Email. Emails don't have a tone, they don't have smileys (means they are not used). Writing a good email, is an art. It is very important to learn how to write such kinds of emails.Emails asking client to provide information, with accurate requirement list.Polite Emails for making client realize the wrong they have done.Emails providing consultancy services. See email consultancy is a big time opportunity and costless service, in future a good means of earning.Writing intra-office emails.Whom to keep in CC, Never to use BCC, how should be the subject line, how should be the signature etc.When email shouldn't be used & telephonic conversations should be preferred, sending reminders, how to use meeting feature, etc.(d) Oral Communications - F2F or telephonic or over internetThis is again a great area to learn. It very necessary to learn how to interact with clients. The interaction can be face to face, or telephonic or over internet services like skype, etc. It very important to learn to learn how to deal with such situations. A conversation over telephone, has to be polite and discussing documents over telephone is also an art. Similarly communication over Skype is also an interesting thing to learn, one should know how to have business conversations over Skype and how to share documents, discuss & present over it.(e) Formatting documents - Something that stupids call stupidity!I have seen documents and emails from fellow Chartered Accountants, so pathetically formatted, that I sometimes wish to hit them with a stone, maybe their sense would come back then. But basically the idea is Chartered Accountants are professionals, and therefore, a professional behaviour is expected from them. The behaviour is expected highest in the documents and reports. Thus, it is very important to learn:Appropriate font sizes, font stylesHow to add tables in emails, how to structure an email, maximum size of emails, minimum size of emailsWhen to use and when not to use - bold, italics, underlines, shades, coloursHow to structure paragraphs, appropriate line spacingHow to convert documents into different formatsHow much margins to keep, how to make document print readyHow to make document secureHow to make documents self-explanatory by adding commentsHow to use various functions like footnotes, document review, freeze panes, grouping - sub-grouping, page numbers, author details etcCover page for report, report size, number of maximum pages, drafting executive summary, adding disclaimers, etc.Conclusion:The Part A makes you an intelligent Chartered Accountant.The Part B makes you an intelligent Human Being.And let me tell you, Part B is more important, because even if you don't become a CA, an intelligent human being can definitely live a good career!Ignoring the part B is very common amongst CA, and that's why MBAs getting an edge over CAs is also very common.Many people say 'Articleship is nothing but labour work', well it is because you think it that way, and that's why you are doing it that way. If you try, you will realize articleship period is life changing!"You will have hundreds of opportunities to learn the bigger things once you become CA, but not these small things. Once you become CA, people don't expect you to know everything, they understand it is quite impossible, but they definitely do expect that you know these basic things rightly."
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My startup Netlodge is now widely known worldwide in the startup community and by tech giants. How do I raise capital for the fi
Yan, sorry, but I suggest that you rephrase your question. Your startup is NOT known on a global scale and you failed to raise money for almost a year now. You started well by telling the Quora community that you are a 17 year old kid and want to change the world. So far you have just a collection of videos on your site. Your site ranks to be around the 1,000,000th website and you are far from having the traction you pretend to have.But hey - trying is still a good thing :) 1) Get real - stop pretending2) Find a mentor who can help you form a business3) Get traction Then start again
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What is the Einstein tensor? What is it used for?
As John A. Wheeler famously said, matter tells space how to curve and space tells matter how to move. The way matter tells space how to curve is expressed in the Einstein’s gravitational field equations of General Relativity:G = 8πT,where on the right side, we have the energy momentum tensor of matter, T (the source of gravity), and, on the left side, we have Einstein tensor G (expressing the curvature of space). (This equation is written for simplicity in geometrical units.) So there you have – Einstein tensor G describes the curvature of Riemannian space (or, more precisely, curvature of pseudo-Riemannian spacetime) in response to the presence of matter (described by the energy momentum tensor T).The Einstein tensor, by definition, is:G = R – ½ Rg,Where R is the Ricci tensor, R is the scalar curvature, and g is the metric tensor. In components, this definition can written asGμν = Rμν – ½ R gμνDespite its deceptive simplicity, the Einstein tensor is a non-linear function in second partial derivatives of the metric tensor g, which is why Einstein field equations (unlike Newtonian equations of gravity or Maxwell equations of electrodynamics, which are all linear) are non-linear and notoriously difficult to solve.An important property of the Einstein tensor is that is divergence vanishes as the expression of the Bianchi identities:∇G =0This assures the energy conservation for matter, which follow from the Einstein field equations∇T =0In fact, the Einstein tensor is the only tensor function of the metric with identically vanishing divergence, which was what led Einstein to his field equations of gravity.
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