Edmund Hillary and Tenzing Norgay used supplemental oxygen to summit Mount Everest. The area above 8,000 meters (26,250 feet) on Everest is called the “Death Zone.” This is because the air is thinner, meaning that the concentration of oxygen is lower. An inadequate oxygen supply, known as hypoxia, can cause confusion, lack of muscle coordination, and death. More than 95 percent of climbers who summit Everest use supplemental oxygen, though some consider this cheating.
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