John Hoffecker, University of Colorado at Boulder (IMAGE)
Caption
CU-Boulder researcher John Hoffecker, shown here working at a site in Russia dating back 45,000 years, believes there is mounting archaeological evidence for the evolution of a human "super-brain" no later than 75,000 years ago that spurred a modern capacity for novelty and invention.
Credit
Vance T. Holliday, University of Arizona
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