Essentially every scientist, when posed with the question, "If you want to get science knowledge from Mars, do you want to send a geologist or do you want to send a robot?" Well, the real answer is, you can send 100 robots for the price of sending one geologist, so let's send 100 robots to 100 different locations, and then we would all benefit. So that's the answer you would get. And I agree with that answer.

The persistent failures of controlled, double-blind experiments to support the claims of parapsychology suggest that what's going on is nonsense rather than sixth sense.

So not enough people in this world, I think, carry a cosmic perspective with them. It could be life-changing.

The universe's destiny has very little to do with the near-term destiny of Earth.

I am proud to be part of a species where a subset of its members willingly put their lives at risk to push the boundaries of our existence.

But one of the coolest things about meteorites is that most were formed four-and-a-half-billion years ago, during the birth of our solar system, when, for reasons not yet known, a cloud of gas and dust was transformed into a sun with circling planets.

I think the material that inspires artists is the fabric of the soul of civilization.