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Discovery of 4.4-Million-Year-Old Hominid "Ardi" Is Greatest Scientific Breakthrough of 2009

Venerable journal Science has announced its top breakthroughs of 2009, and topping the list is a breakthrough in evolutionary biology. It's the discovery of Ardipithecus ramidus, a 4.4-million-year-old hominid skeleton that reveals how homo sapiens' ancient ancestors looked and lived. »12/17/09 2:24pm12/17/09 2:24pm