The art of flight, circus style

    Cirque du Soleil's trapeze artists seemingly defy physics, but their feats are only made possible by a coach who instills trust.

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    Nepalese mountaineer Pemba Dorje Sherpa (L) and others pause at the Hillary Step while pushing for the summit of Everest on May 19, 2009. from the south face of Nepal.    Bad weather conditions forced three Nepalese Sherpa brothers to give up their plans to set a new world record by spending 24 hours in the "death zone" on top of Mount Everest. Pemba Dorje Sherpa, 30, and his two younger brothers reached the summit on May 19, but were forced down after only two hours, Pemba told AFP after returning to Kathmandu.      AFP PHOTO/COURTESY OF PEMBA DORJE SHERPA (Photo credit should read STR/AFP/Getty Images)

    Why sherpas are superhuman mountaineers

    Mount Everest is the ultimate test for adventurers trying to test their boundaries, but when it comes to climbing this natural monument, one group of people excel -- Sherpas.