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.

Climate change is a real deal. So, hey deniers - cut it out, and let's get to work.

But investment in space stimulates society, it stimulates it economically, it stimulates it intellectually, and it gives us all passion.

But as the cerebellum degrades with age, so does the quality of memories. The memories are there, but they're not as good.

If the Earth gets hit by an asteroid, it's game over. It's control-alt-delete for civilization.

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.

SCIENCE is a part of EVERYONE'S everyday life.