An unmanned aerial vehicle films vineyards in France. Drones like this one are also being used in Califiornia, as part of a broader "precision farming" movement designed to lower greenhouse gas emissions. Sami Sarkis/Ocean/Corbis hide caption

itoggle caption Sami Sarkis/Ocean/Corbis

Lactobacillus acidophilus, which is one variety of the genus Lactobacillus is one of the common active cultures found in yogurt and in the human gut. Scimat Scimat/Getty Images/Photo Researchers hide caption

itoggle caption Scimat Scimat/Getty Images/Photo Researchers

These amphipods were discovered by scientists from the University of Aberdeen in waters more than 4 miles deep, north of New Zealand. Similar shrimplike crawlers may lurk at the bottom of the Challenger Deep. Oceanlab/University of Aberdeen/AP hide caption

itoggle caption Oceanlab/University of Aberdeen/AP

Sugar, coffee, fruit juice for babies, oil and salt inside a market subsidized by the government in Havana on July 11, 2013. Enrique De La Osa/Reuters/Landov hide caption

itoggle caption Enrique De La Osa/Reuters/Landov