Donald Johanson

You don't just magically flip some evolutionary switch somewhere and transmute a quadruped into an upright-walking bipedal human.
You don't just magically flip some evolutionary switch somewhere and transmute a quadruped into an upright-walking bipedal human.
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bipedal  evolutionary  flip  

These are some quotes by American author Donald Johanson Scientist, who was born on June 28, 1943.