Solar-Powered Plane Completes Historic Circumnavigation

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Crews work to clean up an oil spill on the North Saskatchewan River on Friday. Husky Energy has said between 200,000 and 250,000 liters of crude oil and other material leaked into the river on Thursday from its pipeline. Jason Franson/The Canadian Press via AP hide caption

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Firefighters battle part of the Sand Fire after flames jumped across a road in Santa Clarita, Calif., on Sunday. As the blaze changed direction multiple times over the weekend firefighters were forced to retreat and thousands of people have been evacuated from their homes. David McNew/Getty Images hide caption

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A typical hoverfly (Spilomyia diophthalma) Fredrik Sjöberg/Fredrik Sjöberg hide caption

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The Uppermost Aristocracy of the Hoverfly Society

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Wendy Chase directs the UConn Speech and Hearing Clinic. It provides help for transgender people working to change how they speak. Bret Eckhardt /Courtesy of Wendy Chase hide caption

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Helping Transgender People Find Their Voice

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Woman holding the dapivirine vaginal ring. Andrew Loxley/International Partnership for Microbicides hide caption

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The HIV Trap: A Woman's Lack Of Control

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A car drives by a Switch data center in Las Vegas on Sept. 9, 2015. In 2013, data centers consumed 2 percent of all U.S. power — triple what they used in 2000. John Locher/AP hide caption

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Making The Cloud Green: Tech Firms Push For Renewable Energy Sources

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Yao honey hunter Orlando Yassene holds a male greater honeyguide temporarily captured for research in the Niassa National Reserve, Mozambique. The birds will flutter in front of people, tweet and fly from tree to tree to guide hunters to bees' nests that are hidden inside the trunks of hollow trees. This teamwork could date back thousands or even a million years. Claire Spottiswoode hide caption

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How Wild Birds Team Up With Humans To Guide Them To Honey

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Invisibilia: How A Shirt Collar Helped A Man Survive Auschwitz

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Research Provides New Insight Into The Evolution Of Human Microbes

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Earlier studies have found that children who grow up in houses with a TV on many hours a day learn fewer words than children in households with less TV time. Heleen Sitter/Getty Images hide caption

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New Words With Quieter Background Chatter

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