Russia and other hostile states have become increasingly brazen in adopting “gray zone” attacks against Europe and the United States, leaving defense officials with a dilemma: How to respond ...

A dementia diagnosis is the start of a journey, not the end. Sanjay Gupta, neurosurgeon and CNN chief medical correspondent, shares tips to navigate the road ahead. A dementia diagnosis is the start ...

Twins are pretty rare, accounting for just 3% of births in the U.S. these days. But new research shows that for primates 60 million years ago, giving birth to twins was the norm.