This undated artists reconstruction image provided by the magazine Science, shows Hadrocodium wui. A new analysis of some of the earliest mammal-like creatures shows their complex brain evolved in ... more 
This undated artists reconstruction image provided by the magazine Science, shows Hadrocodium wui. A new analysis of some of the earliest mammal-like creatures shows their complex brain evolved in three major stages starting with the regions that handle the sense of smell. less 
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Associated Press | Photo By Mark A. Klinger, Carnegie Museum of Natural History via Science
Thu, May 19, 2011 2:10 PM EDT