Why does a 747 have 5 engines?

Answer: Greetings from Australia! You may have seen a photo like this: The a.​.​.​ Long's Digest Top Stories For You Why does a 747 have 5 engines? Ben Harris, Lives in Australia (2002 - Current) Updated Mon Greetings from Australia! You may have seen a photo like this: The above Boeing 747 (Which happens to be Australian operated :) ) is carrying a spare engine, probably for ano...  Read More » What are the oldest known equations that need to be solved but no one knows how? Jonathan Devor, PhD Astronomy, Harvard University (2008) Written Jul 30 In mathematics there is a long list of unsolved problems. Some of them date back hundreds, and even thousands of years. It's usually quite hard to trace back an open proble...  Read More » If the job prospects of a PhD is so poor, why would anyone pursue a PhD in the first place? Cencio Farre, I graduated in physics Written Jul 29 Generally speaking, people who choose to pursue a PhD are quite ignorant of their job prospects with said PhD. Or they choose to believe that they are exceptional, and will...  Read More » How do pilots start their jets? Do they use ignition key, enter a password, or some other technician start from an external source? Jacob Shane, Student of aviation for a while. Written Jul 5 If you mean modern commercial Jets, no, there is no starter key or code. Once the pilots are in the cockpit, they can pretty much just start running up the craft. Sometimes...  Read More » Why did the Mongols successfully invade China and were defeated by Vietnam? Xane Feng, I am Chinese Written Jul 8 The Mongols only succeeded in conquering the Southern Song dynasty after a 40-year siege! FORTY FREAKING YEARS! Genghis Khan never got around to attacking Song, he was too bu...  Read More » How tall is Kevin Durant? Marc Restrepo, Musician, Relic Written Jul 9 NBA players in the past would lie about their heights to prevent being locked into certain positions. The most notorious case of this is probably Kevin Garnett who was a leg...  Read More » How do the wealthy live differently that would probably surprise the rest of us? Adam Fayed, Blogger and owner of global online financial advisory firm Updated Jul 28 I remember, a number of years ago I was living in SE Asia. I had a client who was consistently making $15,000-$20,000 monthly after tax for 20+ years. I always assumed that ...  Read More » How is it not safe in China? Matthew Asia, China Language Teacher Employment Agent Written Nov 16, 2017 I've asked many Chinese how dangerous China is during my 11 years here and it's almost always the same answer: "China is very dangerous, there are many pickpockets." The Chi...  Read More » Which film accurately depicts the true personality of a jet fighter pilot, and why? Stephen Smith, former Fighter / Airline pilot. at A Major U.S. Airline (1972-2015) Updated Jul 13 EAfter Top Gun came out, all of our friends wanted my wife and I to go see the movie with them. Then they asked how realistic it was. I told them all that there was only on...  Read More » How did you triple your net worth? William Elliott, Active Long Term Investor and Wealth Builder Updated Jun 18 I have more than tripled my net worth in the last ten years. I also have not had a job which paid more than $15 per hour nor did I earn tips. First let me define net worth. ...  Read More »   Read More in Your Feed Follow Quora on: Get the App for iOS and Android This email was sent by Quora (650 Castro Street #450, Mountain View, CA 94041). If you don't want to receive this type of email in the future, please unsubscribe.http://www.quora.com/