1921: Lt. Col. C.K. Howard-Bury sees the tracks of a "barefooted man" while trying to climb Mt. Everest. His guides tell him tales of the Yeti and claim it guards the peak. (Top left)
1948: Norwegian engineers stumble upon two "dark, hairy beasts," one of which bites an engineer on the shoulder. They attempt and fail to lasso the creatures. (Top right)
1951: Himalayan explorer Eric Shipton follows a set of yeti tracks that suggest the creature was able to nimbly leap across a chasm. (Bottom left)
1952: Sir Edmund Hillary and his guide Ang Pemba, the first men to scale Mt. Everest discover a tuft of Yeti hair. Hillary shakes his fist to the heavens in rage over his near-miss. (Bottom right)
Four layers of underwear.
Interesting, freeze-dried foods. "'When you climb to high altitudes,' Hillary says, 'you need something to titillate your appetite. A can of apricots appealed to me at 28,000 feet.'"
Soft boots, so as not to scare away the Yeti.
A "capture gun," which uses compressed carbon dioxide to shoot a hypodermic needle up to 100 yards.