Quora is a website created in 2010, that I would describe as “the smartest question-and-answer on the Internet”. You’ve got tons of interesting questions and highly qualified persons who answer: I’ve been impressed by this guy who’ve been to Harvard with Natalie Portman, or this very detailed answer to the apparently trivial question “How much did it cost YouTube to stream “Gangnam Style”? “ (more impressive answers here).
In 2012 Quora released “Best of Quora 2010 – 2012”, 131 questions answered brilliantly by qualified people, like Peter Marquez telling us what it’s like to fly on Air Force One. You can get a .pdf of the book here, but here are my best pick of the best off: