Traveling across Australia, Asia, and Africa, he searched for people with little contact with the West who he could examine. Porteus found that the so-called Bushmen of the Kalahari scored a mental age of seven. Yet his subjects were navigating their way through Porteus's printed mazes in the middle of a vast desert that they could navigate without a map, finding all the food and shelter they required.
( Carl Zimmer )
[ She Has Her Mother's Laugh: ]
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