Science is the best thing humans beings have ever come up with. And if it isn't, science will fix it.

To leave the world better than you found it, sometimes you have to pick up other people's trash.

There really is no such thing as race. We all came from Africa. We are all of the same stardust. We are all going to live and die on the same planet, a Pale Blue Dot in the vastness of space. We have to work together.

If you just take a single human and put him or her in the forest he or she might not do very well without some sort of education which he got or she got from some tribe.

Teaching creationism in science class as an alternative to evolution is inappropriate.

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.

People and stars are made of the same stuff.