I never took a day off in my twenties. Not one.

If there was an epidemic, that definitely would make people accept vaccines. I wouldn't hope for that, of course, but if you wanted people to love vaccines, an epidemic would remind them how magical they are.

DNA is like a computer program but far, far more advanced than any software ever created.

Treatment without prevention is simply unsustainable.

To get a big company moving fast, especially on a many-headed opportunity like the Internet, you have to have hundreds of people participating and coming up with ideas.

The only definition by which Americas best days are behind it is on a purely relative basis.

The ideal thing would be to have a 100 percent effective AIDS vaccine. And to have broad usage of that vaccine. That would literally break the epidemic.