Excitement when I read the headline: "Humanity’s upright gait may have roots in trees." Disappointment when I read the theory:
A new analysis of apes’ wrist bones suggests that a two-legged stride evolved from tree climbing, not ground-based knuckle-walking...“Our data show that there is no unequivocal evidence for a terrestrial, knuckle-walking phase in human evolution and provide strong support for a human evolutionary history in the trees,” says [Tracy Kivell of the Max Planck Institute for Evolutionary Anthopology in Leipzig, Germany...]
Kivell and Schmitt [f Duke University in Durham, N.C.] convincingly show that the anatomy of knuckle-walking differs in chimps and gorillas, remarks anthropologist Susannah Thorpe of the University of Birmingham, England. Hominids retained the anatomical basis of an upright stance from a tree-dwelling great ape ancestor, Thorpe proposes.

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