Since its 2010 launch, Q&A site Quora has used its $61 million in VC funding to probe doozies like "What should everyone know about prison?" (It's "overcrowded...yet it feels like the loneliest place," writes an inmate at San Quentin.) Here are some of the site's most popular questions.

Q: Which are some of the most epic photos ever taken?

Top answer: Apollo 8 photo of Earth taken from the moon. 

Q: What are some interesting examples of photographs that show historical figures in unexpected places or company?

Top answer: A photo of Ronald Reagan in Russia. Next to him is a tourist the photographer claims is actually Vladimir Putin.

Q: What are the most surreal places one can ever visit?

Top answer: 1. The Hidden Beach in the Marieta Islands near Puerto Vallarta, Mexico; 2. Skaftafell, Iceland; 3. The Wave, Arizona; 4. Moraine Lake, Canada; 5. Berry Head Arch, Canada; 6. Uluru, Australia.

Q: Given our current technology and with proper training, would it be possible for someone to become Batman?

Top answer: "The simple answer is no... The genius of Batman is that it pretends to be realistic. It lets us convince ourselves that with enough money and training, we could become Batman, too."

Q: What is it like to always be the smartest person in the room?

Top answer: "It sucks. It means you are in the wrong room."