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Facebook CEO Mark Zuckerberg held an impromptu online Q&A on the social network Tuesday afternoon, and everyone from renowned astrophysicist Stephen Hawking to Arnold "The Terminator" Schwarzenegger joined the discussion. Here are a few highlights from the session, which attracted over 47,000 likes and 28,000 comments (and counting) in just an hour.
Arnold Schwarzenegger: "I always tell people that nobody is too busy to exercise, especially if Popes and Presidents find time. You've got to be one of the busiest guys on the planet, and younger generations can probably relate to you more than they can the Pope - so tell me how you find time to train and what is your regimen like?
And by the way - will the machines win?"
Zuckerberg: "Staying in shape is very important. Doing anything well requires energy, and you just have a lot more energy when you're fit. I make sure I work out at least three times a week -- usually first thing when I wake up. I also try to take my dog running whenever I can, which has the added bonus of being hilarious because that basically like seeing a mop run.
And no, the machines don't win. :)"
Stephen Hawking: "I would like to know a unified theory of gravity and the other forces. Which of the big questions in science would you like to know the answer to and why?"
Zuckerberg: "That's a pretty good one! I'm most interested in questions about people. What will enable us to live forever? How do we cure all diseases? How does the brain work? How does learning work and how we can empower humans to learn a million times more?
I'm also curious about whether there is a fundamental mathematical law underlying human social relationships that governs the balance of who and what we all care about. I bet there is."
Zuckerberg also answered more than a dozen other questions, ranging from the future of news on Facebook to the Facebook naming controversy with transgender users, and why he chooses to have a $1 salary ("I've made enough money.")
Perhaps the most revealing answer of all came when Miller Savetz asked a question many Facebook users have pondered over the years: "Why did you come up with poking?"
Zuckerberg's honest answer: "It seemed like a good idea at the time."