What was it about our Neanderthal cousins that prevented them from evolving? In this video segment from The Human Spark, host Alan Alda searches for the answer to that question at the excavation site of Roc de Marsal, a collapsed rock shelter in Southwestern France and former home to the Neanderthals. It is there where Alda discovers how the Neanderthals' inability to be innovative contributed to their extinction.
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