Many blacktip reef sharks in French Polynesia are commonly fed by tourists. But the low-quality diet is changing the sharks’ behavior and physiology.

Men have two birth control options: condoms and vasectomies. Why has it taken so long to develop more contraceptives?

A recent flurry of executive orders and surprise actions by the Trump administration have roiled WHO, the CDC and the international public health community.

After decades of study, scientists sound genuinely optimistic about the possibility of detecting primordial black holes, which might explain dark matter.