You don't just magically flip some evolutionary switch somewhere and transmute a quadruped into an upright-walking bipedal human.
bipedal evolutionary flip
Donald Johanson
These are some quotes by American author Donald Johanson Scientist, who was born on June 28, 1943.
Quotes by Donald Johanson
Evolution explains our biological evolution, but human beings are very unique creatures. As the Dobzhansky said, all animals are unique; humans are the uniquest. And that uniqueness of being human, language, art, culture, our dependency on culture for survival, comes from the combination of traditional biological evolution.
Donald Johanson
Related Quotes
What's changed is we now have good anatomical, geological, archaeological evidence that Neanderthals are not our ancestors. When I wrote 'Lucy,' I considered Neanderthals ancestors of modern humans. We have gone back twice the age of Lucy, six million years. And we see that upright bipedal walking goes back that far in time.