Plankton collected in the Pacific Ocean with a 0.1mm mesh net. Seen here is a mix of multicellular organisms — small zooplanktonic animals, larvae and single protists (diatoms, dinoflagellates, radiolarians) — the nearly invisible universe at the bottom of the marine food chain. Christian Sardet/CNRS/Tara Expeditions hide caption

itoggle caption Christian Sardet/CNRS/Tara Expeditions

Various food items that contained trans fats in November 2013. That month, the Food and Drug Administration first announced plans to ban partially hydrogenated vegetable oils from all food products. A final rule is expected any day now. Scott Olson/Getty Images hide caption

itoggle caption Scott Olson/Getty Images

A morning's berry harvest from West Philadelphia's Ogden Orchard includes raspberries, gooseberries, currants, goumis and mulberries. Courtesy of Philadelphia Orchard Project hide caption

itoggle caption Courtesy of Philadelphia Orchard Project

Men in hazardous materials suits load dead poultry to be buried at Rose Acre Farms Inc., just west of Winterset, Iowa, on May 11. John Gaps III/AP hide caption

itoggle caption John Gaps III/AP

The White House announced an action plan Tuesday aimed at reversing dramatic declines in pollinators like honeybees, which play a vital role in agriculture, pollinating everything from apples and almonds to squash. Joe Raedle/Getty Images hide caption

itoggle caption Joe Raedle/Getty Images

A late 19th-century samovar made in Tula, Russia, a metalworking town south of Moscow. The very first samovar factory opened in Tula in 1778. As demand for samovars grew, the town became almost synonymous with the production of the giant hot-water urns. Sheldon Luskin Collection/The Museum of Russian Art, Minneapolis hide caption

itoggle caption Sheldon Luskin Collection/The Museum of Russian Art, Minneapolis

Nat Bradford holds a Bradford watermelon, known for its sweet, fragrant red flesh. The melon was created by Bradford's forefathers around 1840 and was once one of the most important and coveted melons of the South. Heather Grilliot/Courtesy of Bradford Watermelons hide caption

itoggle caption Heather Grilliot/Courtesy of Bradford Watermelons

Mchezaji "Che" Axum stands in a hoop house at the University of the District of Columbia's Muirkirk Research Farm, a resource for urban farmers in the city. Whitney Pipkin for NPR hide caption

itoggle caption Whitney Pipkin for NPR