The levels of nitrogen-15 in Neanderthal bones are so high that they suggest the early human relatives ate more meat than do carnivores such as hyenas. According to a Science News report, paleobiologist Kimberly Foecke of George Washington University thinks those high levels of nitrogen-15 might be due to the condition of the meat that Neanderthals consumed. To check the levels of nitrogen in rotting meat, Foecke left steaks cut from animals that had been raised without hormones or antibiotics outside in a box covered with mesh, and sampled them daily for 16 days. Preliminary results suggest that the levels...