If you just take a single human and put him or her in the forest he or she might not do very well without some sort of education which he got or she got from some tribe.

Talk about science with everyone you meet. Especially talk about climate change. It needs to become a part of our everyday conversation (the way it is everywhere else in the world).

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

Our goal in science is to discover universal laws of nature. If one's faith requires one to abandon or ignore natural laws, well, that person is going to have trouble reconciling religion and science. Otherwise, there is no any conflict.

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.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

When we explore the cosmos, we come to believe and prove that we can solve problems that have never been solved. It brings out the best in us. Space exploration imbues everyone with an optimistic view of the future.