Tom Frieden

New, unfamiliar, and mysterious threats to our health are scary. At the Centers for Disease Control and Prevention - where we identify, on average, one new health threat each year - we work around the clock with an approach that prioritizes finding out what we need to know as fast as we can to protect Americans.

Zika is spread by mosquitos. They are tough to control. It will bite four or five people at one blood meal. They can breed in the amount of water it takes to fill up a bottle cap or, theoretically, even a drop of water. You have to get rid of maybe 90% of them or more before you protect people.

If a man made himself an expert in any particular branch of human activity, there would result the strong tendency that a peculiar aptitude towards the same branch would be found among some of his descendants.

Everybody goes to clinics, to hospitals, to doctors, and so on. Some people go to Planned Parenthood. But you don't have to go to Planned Parenthood to get your cholesterol or your blood pressure checked. If you want an abortion, you go to Planned Parenthood, and that's well over 90 percent of what Planned Parenthood does.