facts and things to know about Mt. Everest
1921 — Dalai Lama allows British reconnaissance party to visit Tibet and the northern side of Mt. Everest.
1924 — British explorers George Mallory and Andrew Irvine disappear near the summit, along the Northeast Ridge. It is possible that they may have actually been the first to reach the summit, but they never returned.
1949 — Nepal opens its borders, making access to the mountain's southern peak possible.
1953 — Hillary and Norgay reach summit.
1963 — First Americans reach the summit.
1989 — First two women, both American, reach the summit.
1990 — Sir Edmund Hillary's son, Peter, reaches summit.
1996 — Eleven people die during spring expeditions.