The former president foreshadowed some of the legal challenges he will mount against the unprecedented federal criminal case against him.

The country's toll makes up nearly a third of the world's 619,000 malaria deaths each year. Now Nigeria has approved a new vaccine. Will it get into the arms of those who need it most?

Over the last century, we've seen a huge improvement in the accuracy of weather forecasts. A new study suggests these better forecasts have tremendous value for our lives and our economy.

Taken after sex, the antibiotic doxycycline can ward off some sexually transmitted illnesses. Doctors are already prescribing it and the CDC is expected to share guidance soon for how best to use it.