Our ancestors 36,000 years ago drew this horse in the Chauvet Cave, in the Ardeche region of France. Courtesy of the Chauvet Cave Museum

Our ancestors 36,000 years ago used charcoal from wood to draw this horse in the Chauvet Cave, in the Ardeche region of France. Courtesy of the Chauvet Cave Museum

Our ancestors 36,000 years ago used charcoal from wood to draw this horse in the Chauvet Cave, in the Ardeche region of France. Courtesy of the Chauvet Cave Museum

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