Science isn't just about solving this or that puzzle. It's about understanding how the world works: the whole world from the vastness of the cosmos to the particularity of an individual human life. It's worth thinking about how all the different ways we have to talk about the world manage to fit together.

A full understanding of what happens in our everyday lives needs to take into account what happened at the Big Bang. And not only is that intrinsically interesting and just kind of cool to think about, but it's also a mystery that is not given much attention by working scientists; it's a little bit underappreciated.

The idea that time is an illusion is an old one, predating any Times Square ball drop or champagne celebrations. It reaches back to the days of Heraclitus and Parmenides, pre-Socratic thinkers who are staples of introductory philosophy courses.

If time travel were possible, you still wouldn't be able to change the past - it's already happened!

Yes, for my undergrad I majored in Criminal Justice and minored in Political Science and English.

There does seem to be a sense in which physics has gone beyond what human intuition can understand. We shouldn't be too surprised about that because we're evolved to understand things that move at a medium pace at a medium scale. We can't cope with the very tiny scale of quantum physics or the very large scale of relativity.

Philosophy is not just about talking or lecturing or even reading long, dense books. In fact, it is something men and women of action use - and have used throughout history - to solve their problems and achieve their greatest triumphs. Not in the classroom but on the battlefield, in the forum, and at court.

You learn on the job. When I was a young lawyer and got a case, I knew nothing about the subject. You start reading, you look for the philosophy behind it, and by the time you are actually in a court of law, you are a master.