Koofas

If you had to give an estimate of the amount of weed you've smoked over your lifetime, how much would you guess?

Hi Chris, I've always been fascinated with space and space travel, really from when I was a little kid. I was wondering, what is the hardest part about re-adjusting to Earth once you return from a long stay in micro-g? Also, I would like to know what you think about NASA's discovery of evidence of water on Mars.

Thanks!

I just watched Zero Days yesterday morning, and I was wondering if you could tell us a little bit more about Stuxnet. What was the feeling like when you realized how big of a deal it was? Also, I was really surprised by how much collaboration goes on between anti-virus guys, how do you keep something like that secure when you're dealing with something from a nation-state?