The most serious problem facing humankind is climate change. All of these people breathing and burning our atmosphere has led to an extraordinarily dangerous situation. I hope next generation will emerge and produce technology, regulations, and a worldview that enable as many of us as possible to live happy healthy lives.

Evolution is not something you can believe in or not believe in like do you believe in gravity.

Climate change is happening, humans are causing it, and I think this is perhaps the most serious environmental issue facing us.

I'll admit that the discovery of evolution is humbling, but it is also empowering. It transforms our relationship to the life around us. Instead of being outsiders watching the natural world go by, we are insiders. We are part of the process; we are the exquisite result of billions of years of natural research and development.

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.

Science provides a much more satisfactory way to seek answers than does any religion.

I've got no problem with anybody's religion. But if you go claiming the Earth is only 10,000 years old, that's just wrong.