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!

I wanted to be a marine biologist my whole life until I graduated high school. And even now, I'm still like, 'Maybe I'll just quit the biz and go to Santa Cruz and study marine biology and have my own research center in the Bahamas.' Yeah, I'm sure it would be just that smooth.

It would seem that I, who never could make much sense of physics when I was at school, have now gained a strong sense of Einsteinian space-time. I am free of the nimbyism of now, and feel a strong kinship with both the dead and the unborn.

When we benefit from CT scanners, M.R.I. devices, pacemakers and arterial stents, we can immediately appreciate how science affects the quality of our lives.

Explorations into chemistry were done in our basement, sometimes with friends, and my parents must have had quite a bit of confidence in my abilities when they allowed me to experiment with explosive mixtures.