Blood pinning is a long-standing and controversial tradition in the US military. What’s the story behind it, and why does it continue? Discover the history, the ritual, and the debate ...

Gray seals may possess a secret sense that helps them survive at sea. The marine mammals adjusted their time spent underwater based on the amount of oxygen in the air they breathed before diving ...

David Goggins had run 70 miles of his 100-mile race when he began to pee blood. It was 2005. Goggins, a 240-pound Navy SEAL, had entered the San Diego race to raise money for charity. It was his ...