Abstract:Short abstractHominin procedures for fire-starting, sharpening rocks, and softening roots all require sustained attention for hours. Shade is sought in the brush fringe bordering a grassland. The clustering of these more versatile adults, while others are away hunting and gathering, provides a setup for assortative mating. This can enhance versatility and, with it, brain size. Enlargement is accelerated by a boom-and-bust cycle in their meat supply whose amplifying feedback favors shade seekers. This nonrandom… Show more
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