Rare gases boost blood cells and mimic the effects of altitude.
Pilots fly up to 230 miles per hour just above motor-speedway courses in the the Red Bull Air Race, which resumes in September.
With no muscles in our fingers or toes, how come humans are able to climb every mountain? Or, climb some of them anyway!
Against a beautiful French Polynesian backdrop, the world's top surfers took to the water in search of waves that could make them champions.
The sixth year of the Red Bull Cliff Diving World Series stops in the U.S. this weekend at a new site: Divers will launch from a platform on the precipice of Hell's Gate in Possum Kingdom Lake, Texas. See photos from previous competitions.
Poor Indian schoolgirl tackles Tibetan side of the world's most famous mountain.
Mt. Everest is a natural laboratory that continues to teach scientists lessons about how the body works and why lack of oxygen causes so many problems for climbers and heart failure patients.
ER staff who treated participants after a Tough Mudder event in Pennsylvania said that it's unlikely that participants comprehend the actual risks.
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