A two-and-a-half-year-old is pretty experienced at making a mess, anyway.

Millennial voters are very concerned about climate change and will vote for candidates who are planning to address it. But the systems that are in place - people talk about gerrymandering and the money that's in politics, this is a real thing, a real effect - and it's hard for climate change-denying legislators to get voted out. But I predict it will happen.

There's nothing I believe in more strongly than getting young people interested in science and engineering, for a better tomorrow, for all humankind.

My father was a very good Boy Scout. He was very skilled with knots, and he showed me how to tie a bow tie.

Speaking of human computers, there is a guy named Art Benjamin, he's a human calculator. He says it's a skill he learned as a kid. Now he's a math professor at Harvey Mudd. He can find the square root of a six digit number in a few seconds. Practice.

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

The most serious problem facing humankind is climate change.