Donald Johanson Quotes: 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. (Donald Johanson)

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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