There's a new episode of PBS Eons on Youtube,  The live and death of Lucy, who is the Australopithecus discovered in Ethiopia in 1974, says much about human evolution.  She lived about 3.2 million years ago.

Did our most famous fossil ancestor, Lucy, die by falling out of a tall tree? The answer is part of a decades-long debate over how, exactly, our ancestors transitioned from life in the trees to life on the ground.