As smoking rates have fallen in the U.S. and Europe, tobacco companies have focused their advertising elsewhere, especially Asia. In the Philippines, 25 percent of the population smokes, and cigarettes are a leading cause of death. But one former smoker is cultivating a grassroots campaign to...

Pandemics like Zika and Ebola can originate in one continent and quickly spread to another. To stop outbreaks before they start, scientists are trying to identify regions conducive to the development of new disease. One target is southern China, where factors such as daily wildlife trade and...

The Centers for Disease Control have released new guidelines for combating Zika virus, including a recommendation that men refrain from unprotected sex with women who are pregnant or trying to get pregnant. Judy Woodruff talks with science correspondent Miles O’Brien, reporting from Brazil, about...