I have thoughts every day that are themselves tweets.

If factual information upsets you, then you are creating a world that is not embracing objective truths, and that's not how you advance a democracy.

We didn't build the interstate system to connect New York to Los Angeles because the West Coast was a priority. No, we webbed the highways so people can go to multiple places and invent ways of doing things not thought of by the persons building the roads.

In life and in the universe it's always best to keep looking up.

If you love what you do, you'll be your best at it compared to anything else you might have chosen as a career. Or at least you will love it more, and you won't lead a depressed day of your life.

Science is a cooperative enterprise spanning the generations. It's the passing of a torch from teacher to student to teacher. A community of minds, reaching back to antiquity and forward to the stars.

Pretending to know everything closes the door to finding out what's really there.