A Concord native is seeking to become the fastest person to climb Mount Everest without using supplemental oxygen.

Add Yahoo as a preferred source to see more of our stories on Google. As the Sherpa team fixed the last meters of rope to the 8,849m summit of Everest today, the Khumbu Icefall and the Lhotse Face ...

Andrzej Bargiel, a 37-year-old ski mountaineer from Poland, has achieved what no other human has ever managed before. He successfully climbed Mount Everest without bottled oxygen and then skied all ...

As altitude increases and oxygen levels drop, climbers on Kilimanjaro face physiological risks that can turn a straightforward hike into a dangerous situation.

Four climbers went up and down Everest in under a week with the help of xenon gas—a record-breaking ascent that has ignited controversy in the mountaineering world. To reach the highest point on Earth ...