Hunting for meteorites is like trying to find a pebble on miles of beach.

I'd like - inviting aliens and have them observe what we do because so much of what we do that we take for granted will just be weird or extraordinary or just plain dumb when observed by an alien from another civilization.

I object to religion in science classrooms not because it's religion but because it's not science.

This past year, we received our second Emmy nomination for Outstanding Informational Series. While we'd all like to win, I can say with utmost sincerity that it mattered more to me that we got noticed than whether or not we win.

Do you realize that if you fall into a black hole, you will see the entire future of the Universe unfold in front of you in a matter of moments and you will emerge into another space-time created by the singularity of the black hole you just fell into?

Many people feel small because they're small and the universe is big, but I feel big.

But to carve the Grand Canyon, Earth required millions of years. To excavate Meteor Crater, the universe, using a sixty-thousand-ton asteroid traveling upward of twenty miles per second, required a fraction of a second. No offense to Grand Canyon lovers, but for my money, Meteor Crater is the most amazing natural landmark in the world.