Polio is not endemic in the United States, but the disease is circulating in 30 other countries now. A doctor explains how to protect against polio when traveling.

Scientists at the University of East Anglia (U.K.) have uncovered a hidden link between gut health and the immune system—all thanks to a tiny island bird. Researchers studied the Seychelles warbler, a ...

Here is more on the World Baseball Classic's 2026 tiebreaker rules.

It smells like rotten eggs, releases toxic gases, endangers sea life and scuttles vacations. Scientists, startups and ...