Perhaps we’ve never been visited by aliens because they have looked upon earth and decided there’s no sign of intelligent life.

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

I'm an educator, and I'm a scientist, and I speak what is objectively true. And if that offends you, I can try to have a conversation with you to ask why it offends you, and tell you why objective truth should not offend you because that's how the world works.

For me, I am driven by two main philosophies, know more today about the world than I knew yesterday. And along the way, lessen the suffering of others. You'd be surprised how far that gets you.

People generally don't recognize how long it takes to conceive, publish, and write a book.

When you're advancing a frontier it stimulates creativity to find solutions.

Let's invent a new tomorrow and then make it happen. Let's invent the city of tomorrow, the home of tomorrow, the transportation of tomorrow.