Who can afford to do professional work for nothing? What hobbyist can put three man-years into programming, finding all bugs, documenting his product, and distributing it for free?

The US spends more on energy R&D than all other countries put together, and I personally consider it quite inadequate.

We've got to put a lot of money into changing behavior.

If I had a dollar for every time someone made fun of me in high school-oh wait, I do!

Money has always been in politics. And I'm not sure you'd want money to be completely out of politics.

I have drifted away from thinking about these philanthropic things. And it was only as the wealth got large enough and Melinda and I had talked about the view that wealth wasn't something that would be good to just pass to the children.

The death of a child is an incredible tragedy all over the world. Back in 1990, about 12 percent of children were dying before they reached the age of 5.