Science is the best thing humans beings have ever come up with. And if it isn't, science will fix it.

If NASA is to reach beyond the Moon and someday reach Mars, it must be relieved of the burden of launching people and cargo to low earth orbit. To do that, we must invest more in commercial spaceflight.

The Big Bang banged, and for some reason we’re here. And that’s astonishing. And that we can understand that, that’s the most astonishing.

For me, the meaning of life is pretty clear: Living things strive to pass their genes into the future.

The debate [in Undeniable] was nominally about creationism as a "viable" explanation for what we observe around us. For my side, the debate went very well; I'm not sure what I would change, although I can imagine shortening my answers during the rebuttals, perhaps.

Our goal in science is to discover universal laws of nature. That pursuit fills me with wonder.

What happens to other species also happens to us.