If you want grown-ups to recycle, just tell their kids the importance of recycling, and they'll be all over it.

NASA is an engine of innovation and inspiration as well as the world's premier space exploration agency, and we are well served by politicians working to keep it that way, instead of turning it into a mere jobs program, or worse, cutting its budget.

In another couple centuries I'm sure that worldview won't even exist. There's no evidence for it.

For me, the meaning of life is pretty clear: Living things strive to pass their genes into the future.

Climate change is a real deal. So, hey deniers - cut it out, and let's get to work.

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

I just want to remind us all there are billions of people in the world who are deeply religious, who get enriched by the wonderful sense of community by their religion. But these same people do not embrace the extraordinary view that the Earth is somehow only 6,000 years old.