Once a discovery has been published, there is no way of un-publishing it.

I personally don't think of myself as either an optimist or a pessimist.

Discovering traces of life on Mars would be of tremendous scientific significance: The first time that any signs of extraterrestrial life had ever been detected. Many people would also find it heartening to learn that we're not entirely alone in this vast, cold cosmos.

Nanotechnology has been moving a little faster than I expected, virtual reality a little slower.

The Massachusetts Institute of Technology accepts blacks in the top ten percent of students, but at MIT this puts them in the bottom ten percent of the class.

Fighting in Brazil is always great because you're close to the fans. It's a good energy on fight day: during the open workouts, the support on social media is always closer.

I am worst when it comes to social media.

I love technology, and man, is it helpful. But it also means you're always on. Always findable. Always available to 'just take five minutes' to answer an email, tweet a link for someone, check in quickly on FourSquare.