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Siri's answer to the brain-teaser question "What's zero divided by zero" generates a response that people find both funny and unnerving. NPR hide caption

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Ben Affleck poses in the press room with the Hollywood film award for Gone Girl at the Hollywood Film Awards in Los Angeles. PBS says it's postponing the third season of Finding Your Roots after an internal investigation of an episode about Affleck's ancestors. Jordan Strauss/Jordan Strauss/Invision/AP hide caption

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One of the 20 GPS sensors deployed on Greenland's Helheim Glacier to track its movement. Alistair Everett/Swansea University hide caption

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An illustration of Pappochelys, based on its 240-million-year-old fossilized remains. This ancestor to today's turtle was about 8 inches long. Rainer Schoch/Nature hide caption

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