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If confirmed, the Paleolithic "murder" would be the first compelling case for an anatomically modern human using a weapon against a member of the extinct human species.]]>http://www.plime.com/plime-com/l/94847/1/http://www.plime.com/science/l/71615/1/http://www.plime.com/science/l/41764/1/http://www.plime.com/arts/l/99916/1/http://www.plime.com/science/l/35619/1/http://www.plime.com/science/l/35932/1/http://www.plime.com/science/l/123279/1/http://www.plime.com/science/l/25267/1/http://www.plime.com/science/l/7062/1/http://www.plime.com/science/l/58581/1/http://www.plime.com/science/l/13053/1/http://www.plime.com/science/l/38961/1/http://www.plime.com/plime-com/l/20666/1/http://www.plime.com/science/l/5886/1/http://www.plime.com/plime-com/l/130587/1/Most people find the chemical, known as PTC, very bitter, but 25% cannot taste it at all.

The two groups have different taste receptors on their tongues.]]>http://www.plime.com/plime-com/l/108172/1/ We tend to think of Neanderthals as one species of cavemen-like creatures, but now scientists say there were actually at least three different subgroups of Neanderthals.]]>http://www.plime.com/science/l/10189/1/