Is there an angel or a devil behind the mask? Scientists say it may not matter in terms of anonymous behavior. Joel Saget/AFP/Getty Images hide caption

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Five savory cupcakes: Chicken potpie, lasagna, grilled cheese, mac n' cheese and the Thanksgiving leftovers. Courtesy of @LisaSKim hide caption

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Abraham Lincoln, circa 1850. Lincoln was a political non-entity before he was elected. Why is he more widely known to history than the presidents who came immediately before and after him? Hulton Archive/Getty Images hide caption

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Actors Stan Laurel and Edna Marlon play at socializing around the campfire. It turns out that early man's brain developed in part thanks to cooking. Hulton Archive/Getty hide caption

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Urushiol, the chemical in poison ivy, is also harvested from the Japanese lacquer tree to coat lacquerware. Here, a rash caused by lacquerware that likely was not properly cured. Kenji Kabashima hide caption

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Kyle Glusenkamp pilots Gamera, a human-powered helicopter. Maggie Starbard/NPR hide caption

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