Naturalist Sir David Attenborough, world-famous for his nature documentaries and books, told an interviewer there is one subject that's still a mystery to him - the yeti. He said, "I'm baffled by the Abominable Snowman - very convincing footprints have been found at 19,000 feet. No one does that for a joke."
COMMENT: He is referring to the clear tracks photographed in 1951 by mountaineers Eric Shipton and Michael Ward. A number of explanations have been put forward for the prints, none very convincing. While it's very troubling that no better (or even equal) prints have been documented in the last 58 years, these tracks remain, very simply, unexplaind.