A barefooted runner takes to the streets. Charlie Riedel/AP hide caption

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Tools like these ax heads from Vinelz, Switzerland, were used by Neolithic farmers and may have been part of their sex appeal to hunter-gatherer women. Sandstein via Wikimedia hide caption

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The red specks highlight where the integrity of the brain's white matter is significantly less in the teens who binge drink, compared to those who do not. Courtesy of Susan Tapert/Tim McQueeny/UCSD hide caption

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This decorative shell ornament, attributed to Neanderthals, shows signs of being painted with orange pigment. It's one of several examples of ornamentation that researchers have found in Spain, at sites that were used by Neanderthals as far back as 50,000 years ago. Courtesy of Joao Zilhao hide caption

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Joan Graham's idea is to turn her land into an environmentally friendly cemetery; she's betting that down the road, people will think twice before building a shopping mall on what was once a sacred human burial ground. David Baron for NPR hide caption

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Our sense of time can be influenced by things like drinking coffee, or being on an adrenaline rush from an amusement park ride like this one at Dreamworld in Australia. Bradley Kanaris/Getty Images hide caption

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