Stones striking stones

Human Nature – Part V: Upright Posture, Great Big Brains and Only One Hand Ax

Filed under: cognitive capacities, Evolutionary psychology, Group Selection, Language

For a fossil to be designated a hominin there must be evidence of upright posture.  However, any orthopedic surgeon can tell you that upright posture produces extreme vulnerability for injuries to the lower back (perennially among the top ER visits), hips and knees, so it is reasonable that the evolutionary advantages of such a costly …

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