Politics will take whatever shape it needs for people to get elected. But at the end of the day, the population remains and that's really, as an educator, who I care about.

There's nothing a teacher likes better than ten minute videos. It's not the whole class, but it's not too short, it's enough to wrap a lesson plan around.

I've accomplished enough in life so that I do not fear death.

It is in the best interests of civilization and our economy and our nation to understand what objective truths are as revealed by the methods and tools of science.

I know of no time in human history where ignorance was better than knowledge.

Dark matter and dark energy are two things we measure in the universe that are making things happen, and we have no idea what the cause is.

We account for all the matter and energy that we're familiar with, measure up how much gravity it should have, it's one-sixth of the gravity that's actually operating on the universe. We call that dark matter. It really should be called dark gravity. We don't know what that is.