The highest mountain on the earth attracts many well-experienced mountaineers as well as capable climbers accompanied by professional guides. While not posing substantial technical climbing challenges on the standard route, Everest presents dangers such as altitude sickness, weather and wind. Sir Edmund Hillary and Sherpa Tenzing Norgay became the first courageous people to stand on its summit on May 29, 1953. They ascended through to the South Col from the Khumbu Glacier, and continued their ascent to the summit via the Southeast Ridge. Their route is now referred to as the Normal Route. The best time to climb Everest is in early May before the monsoon season.