Living in 14 villages along the Porcupine herd's migration route, some 7, 000 Gwich'in maintain a traditional culture linked to caribou meat, skins and bone tools.

CNN: mountain

In the Blombos Cave, over the years he and his team have painstakingly unearthed beads likely used by humans on necklaces 75, 000 years ago, bone tools dating back 80, 000 years and the world's earliest known painting kit.

CNN: African roots of the human family tree

The tools also improve the quality of tissue and bone grafts.

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