Archaeologists discovered a cache of ancient stone blades in northern Tibet from some 30,000 years ago. It's the earliest evidence for people living at high altitude and means humans were living in the harsh conditions of the miles-high Tibetan Plateau much earlier than previously thought.

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Archaeologists discovered a cache of ancient stone blades in northern Tibet from some 30,000 years ago. It's the earliest evidence for people living at high altitude and means humans were living in the harsh conditions of the miles-high Tibetan Plateau much earlier than previously thought.