Life at high elevations is tough, as the lower air pressure makes it hard for the body to get enough oxygen into the bloodstream. The weather is often cold but can shift without warning. And if you want to stay very long, you have to find food in an environment where plants and animals are relatively scarce. But around 47,000 years ago, people apparently lived (at least for a while) in a rock shelter 3,469 meters (11,400 feet) above sea level in Ethiopia’s Bale Mountains.
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