Last year, a group of adventurers with National Geographic were hiking Mount Everest when they saw a human foot sticking out of the ice. Now, it is not rare to see dead bodies on the mountain, there are at least 200 of them scattered around Everest, and many of them act as markers for trails, frozen forever in time where they fell. But this human foot in particular, had been on the mountain for 100 years and solved a century old mystery...