•    Mount Everest is rising from 3 to 6 millimetres a year. Everest is also moving northeastward about 3 inches a year.

•    The best time to climb Everest is in early May before the monsoon season.

•    The largest expedition to climb Mount Everest was a 410-climber Chinese team in 1975.

•    The most climbers to reach the summit in a single day was 40 on May 10, 1993.

•    The safest year on Mount Everest was 1993 when 129 climbers reached the summit and only 8 died.

•    The least safe year on Mount Everest was 1996 when 98 climbers reached the peak and 15 died.

•    No one should remain in areas of very low barometric pressure for more than 24 hours, which is why the ascent to Everest from Camp 4 is a race against time.

•    The record for oldest person to scale the mighty peak was set in 2008 by Min Bahadur Sherchan, at age 76 years and 340 days.

•    Tamae Watanabe, 73, made the ascent up the 8,850 meter (29,035 feet) Mount Everest, along with a Japanese partner and three Nepalese Sherpa guides. This successful climb beat her earlier record she’d set 10 years ago, at age 63.

•    Fifty-year-old Nepalese Sherpa, Apa, has scaled Mount Everest a record number of 21 times.

•    The youngest person to climb this mountain is Nepalese Temba Tsheri, who was 15 when he made the attempt in May 2001. — N.F.