That's what makes a human a human, if we store information outside our bodies.

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.

Anybody who grew up with the space program is a fan of science fiction.

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.

When or if answers are found, you can be assured those answers will lead to more questions. Is the troubling or wonderful? It depends on your view of your place in nature, your place among the stars; I suppose.

We should educate more women and girls. Because that is the surest route to controllably, manageably reducing the human population. Educated women have fewer kids. And the kids they do have are better cared for and are more successful. As I like to say, it's not one thing that we need to focus on. It's everything all at once.

The oncoming trouble I speak of is climate change. It's going to affect all of you in the same way the Second World War consumed people of my parent's generation.