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.
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
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.
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
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
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
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