Human Footprints Suggest Surprisingly Early Arrival in the Americas
Science Magazine
It's not easy to say what makes a human -- to define the boundaries of the family. But we now know that it's a big and complex picture, with lots of amazing relatives in it.
Ahana Fernandez trekked through the rainforests of Central America, ears tuned for high-pitched, repetitive chirping and squeaking from greater sac-winged bat pups. Their babbling may shed light on why human babies babble and the origins of speech.
On the genetic level, we're not all that different from chimps. But those small differences in DNA can have huge effects.
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