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Endophytes are microbes that live inside plants — the ones tagged with a fluorescent dye in this image are found in poplars. The microbes gather nitrogen from the air, turning it into a form plants can use, a process called nitrogen fixation. Researchers are looking at how these microbes could be used to help crops like rice and corn make their own fertilizer. Sam Scharffenberger hide caption

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Sam Scharffenberger

Ancient artifacts smuggled into the U.S. and purchased by Hobby Lobby are shown at a May 2 event returning the artifacts to Iraq in Washington, D.C. The seized artifacts include cuneiform tablets from the little-known ancient city of Irisagrig. Win McNamee/Getty Images hide caption

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Win McNamee/Getty Images

Hobby Lobby's Illegal Antiquities Shed Light On A Lost, Looted Ancient City In Iraq

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In a file photo from 2004, a sign at the entrance to the Arrowhead Mountain Spring Water Company bottling plant, owned by Swiss conglomerate Nestlé, on the Morongo Indian Reservation near Cabazon, Calif. Damian Dovarganes/AP hide caption

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Damian Dovarganes/AP

An Indonesian ranger inspects a peat forest fire in Aceh province in July 2017. Indonesia, unlike most of the world, lost less overall tree cover than usual last year. Chaideer Mahyuddin/AFP/Getty Images hide caption

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Asteroid Ryugu, photographed on June 26 by the Hayabusa2 spacecraft, was the Japanese mission's destination. The craft will travel alongside the asteroid for 18 months. JAXA, University of Tokyo and collaborators hide caption

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JAXA, University of Tokyo and collaborators

"If my life were to end next week ... I want to feel like I have made a contribution," said Carol Martin, seen here holding her 2018 Boston Marathon medal. Jesse Costa/WBUR hide caption

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Jesse Costa/WBUR

In his new job overseeing health coverage for 1.2 million workers and their families, Atul Gawande says he hopes to find specific ways to make health care more efficient and the solutions exportable. Dan Bayer /The Aspen Institute via Flickr hide caption

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Dan Bayer /The Aspen Institute via Flickr
Nora Carol Photography/Nora Carol Photography/AFP/Getty Images

Fake News: An Origin Story

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If you are bitten by a Lone Star tick, you could develop an unusual allergy to red meat. And as this tick's territory spreads beyond the Southeast, the allergy seems to be spreading with it. Robert Noonan/Science Source hide caption

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Robert Noonan/Science Source

Red Meat Allergies Caused By Tick Bites Are On The Rise

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A vaccine given during pregnancy protects the baby against whooping cough, but only about 50 percent of pregnant women get it. Nicole Xu for NPR hide caption

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Nicole Xu for NPR

Pregnant Women: Avoid Soft Cheeses, But Do Get These Shots

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How Police Killings Lead To Poor Mental Health In The Black Community

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'What The Eyes Don't See' In Flint

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Some Animals Switching To Nocturnal Life

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