First, it was a knee bone, then a piece of an elbow. An anthropologist saw deep into the past when he discovered a skeleton in Ethiopia that represented a group of human ancestors. To understand a past that goes back millions of years, we often depend on the stories told by fossils. Dr. Biology talks with anthropologist Donald Johanson about the bits and pieces of Lucy and the interesting past that arose with her bones.

Explore more: becominghuman.org
Read more: Did Lucy fall from a tree?

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