But sometimes, there are 208. The fabella, a small bone in a tendon behind the knee, was lost over the course of early human evolution, but these days it’s becoming more common, according to a study ...

But this oversimplified view of human evolution is not quite right ... "It really showed us without a doubt that the skeleton was, like the knee, fully upright — walking like we do," Johanson ...

In 1973, when Don Johanson found a surprisingly human-looking fossil knee at Hadar in Ethiopia that ... discovery -- was the most complete hominid skeleton that had been found up to that time.