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Humans & Society

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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.  

Lucy

LUCY’S PLUNGE  Scientists say that damage to the 3.2-million-year-old partial skeleton dubbed Lucy suggests that this ancient hominid plummeted to her death from high in a tree. That’s a controversial conclusion.

Humans & Society

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