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Tasmanian devil

SURVIVAL GEAR  Some genetic variants may have allowed a small number of Tasmanian devils to withstand a deadly contagious facial tumor that has killed up to 95 percent of them in some locales. The discovery could be good news for the species. 

skull

BLOOD FLOW The internal carotid arteries pass into the skull through two tiny holes (shown with arrows on this human skull). Scientists measured these openings in hominid fossils to estimate changes in blood flow rates to the brain across human evolution.

dogs with MRI machine

GOOD DOGS  To see how dogs process speech, these pooches were trained to undergo MRI brain scans. The results: Dogs are a lot like humans.  



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