Fossil Human Teeth Fan Diversity Debate. The fine print states: "a handful of nearly six-million-year-old teeth is adding fuel to a longstanding debate among scholars of human evolution." Public interest in human evolution is directly proportional to its relationship to our own particular species, so 6 million year old teeth tend to be more of scholarly interest than a 40,000 year old find....

Update: Carl Zimmer has much more. By the way Carl, your last book was phat.