WASHINGTON: Researchers said people likely moved to the Tibetan highlands 3,600 years ago, in an indication of when humans first settled at high altitudes.

Humans were able to permanently settle as high as 3,400 meters (11,000 feet) on the plateau -- which is known as "the roof of the world" -- by growing altitude-resistant crops and raising livestock, according to a study published in the US journal Science.

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