The last time we redefined what it means to be human

Over the past decade, you may have noticed more and more articles referring to "hominins" rather than "hominids." Just why are Homo sapiens and her ancestors now called hominins? The answer isn't just semantic — it has to do with a revolution in the way evolutionary biologists perceive humans' place in the tree of life. » 3/12/12 3:53pm 3/12/12 3:53pm