Anyone who has wrestled knows that it's the hardest thing in the world to do. Anyone who says something else is the hardest thing has never wrestled. That's what I have found. ... You don't wrestle because it's easy, you wrestle because it's hard. I don't do astrophysics because it's easy, I do it because it's hard. And I juxtapose the two in my mind, body, and soul all the time.

After 50 years of television, there's no other conclusion the aliens could draw, but that most humans are neurotic, death-hungry, dysfunctional idiots.

When I would lose matches, I fully respected the person who beat me, because they beat me. I can't blame anybody.

If factual information upsets you, then you are creating a world that is not embracing objective truths, and that's not how you advance a democracy.

Where ignorance lurks, so too do the frontiers of discovery and imagination

Space exploration is a force of nature unto itself that no other force in society can rival.

People like it when they understand something that they previously thought they couldn't understand. It's a sense of empowerment.