Stone Age discovery fuels mystery of who made early tools :

In the past, scientists assumed that our direct ancestors were the only toolmakers.

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New York , United States , Indiana , Kenya , Kenyan , Shannon Mcpherron , Thomas Plummer , Kathy Schick , Rick Potts , Germany Max Planck Institute For Evolutionary Anthropology , Smithsonian Human Origins Programme , Stone Age Institute , Stone Age , Human Origins , Max Planck Institute , Evolutionary Anthropology , Stone Tools , Homa Peninsula Paleoanthropology Project , Queens College , City University ,