A squirrel dying in front of your house may be more relevant to your interests right now than people dying in Africa.

Let us permit nature to have her way. She understands her business better than we do.

The U.S. immigration laws are bad - really, really bad. I'd say treatment of immigrants is one of the greatest injustices done in our government's name.

If you want to make peace with your enemy, you have to work with your enemy. Then he becomes your partner.

I'm not as famous as Stephen Hawking, but certainly in the U.S., I have a very high profile for a scientist. It is an awesome responsibility, one that I don't shoulder lightly.