Acheulian hand axes – thrown for a loop, and a lobe…

from page 146 of Kim Stanley Robinson’s “Fifty Degrees Below.”

“Google Acheulian hand axes,” Spencer said. “You’ll see.”
The next day Frank did that and found it was pretty much as Spencer had said. Certain anthropologists had proposed that the rapid evolutionary growth of the human brain was caused by the mentation necessary for throwing things at a target; and a subset of these considered the bifaced hand axes to be their projectiles of choice, ‘killer frisbees,’ as one William Calvin indeed called them. Used to stampede animals at waterholes, he claimed, after which the hominids pounced on animals knocked over by the rush. The increase in predictive power needed to throw the flattened rocks accurately had led to the brain’s frontal lobe growth.”

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Below the surface...
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