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                  About 40,000 years ago, near the dawn of the 30-millennia-long
                  period known as the Upper Paleolithic, the first anatomically
                  modern humans suddenly and mysteriously revolutionized their
                  cultures with dozens of specialized tools, weaponry, and
                  artifacts. They became deft hunters capable of bringing down
                  massive animals, they tolerated harsh environmental
                  conditions, and they equipped themselves to travel vast
                  distances in search of new frontiers. Many questions still
                  remain about these peoples, including when and how they
                  journeyed to the New World, but experts agree that the answers
                  could someday crystallize from the ever-emerging technological
                  evidence Stone Age humans left behind. In this interactive
                  matching game, consider what roles ten different kinds of
                  primitive artifacts from Europe and North America played for
                  our earliest ancestors. To launch the
                  interactive, click on
                  the image at left.—Lexi Krock
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