Meet Lucy, a 3.2 million-year-old ancestor of ours. Though she looks like an ape, her knees were close together, just like a human’s! That positioned her feet directly under her body and made walking easier.
See the final installment of Your Inner Fish tomorrow night (4/23) on PBS at 10/9c.
"Now, for the first time in its billions of years of history, our planet is protected by far-seeing sentinels, able to anticipate danger from the distant future – a comet on a collision course, or global warming–and devise schemes for doing something about it. The planet has finally grown its own nervous system: us."