Today, twelve Sherpas died in an avalanche on Mount Everest, the worst accident in the mountain's history. (Four are still missing.) The Sherpa community, an ethnic group in Nepal renowned for their mountaineering skills, has long guided foreign visitors up the world's tallest peak. "Sherpas bear the real burden of climbing Mount Everest," American mountaineer Conrad Anker told National Geographic. "They're the ones who take the biggest risks."

Last year we published a story by Stephanie Lowe that described the growing dangers of the mountain and the concerns of the Sherpa guides, whose very job is to risk their lives on Everest's slopes.