Cahokia Mounds State Historic Site in Collinsville, Ill. A thriving American Indian city that rose to prominence after A.D. 900 owing to successful maize farming, it may have collapsed because of changing climate. Michael Dolan/Flickr hide caption
Dorothy Roberts speaks on the TED stage at TEDMED 2015. Sandy Huffiker /TEDMed hide caption
Jen Brea on the TED Stage at TEDSummit2016 in Canada Ryan Lash/TED hide caption
A woman farmers harvests pearl millet in Andhra Pradesh, India. Millets were once a steady part of Indians' diets until the Green Revolution, which encouraged farmers to grow wheat and rice. Now, the grains are slowly making a comeback. Courtesy of L.Vidyasagar hide caption
If they're able to swim to hot water, carp will survive infection with a type of herpes virus. Jean-Louis Wertz/University of Liege hide caption
Carmen Bachmann founded "Chance for Science," a website that connects refugee academics with scientists working in Germany. Thomas Victor for NPR hide caption
While Others Saw Refugees, This German Professor Saw Human Potential
Winston prepares for the hunt. Sure, he's adorable. But can he learn to sniff out fancy truffles? Nick Parish for NPR hide caption
The Golden Age Of Germs Xaver Xylophon/for NPR hide caption
A wild-caught Lybia leptochelis crab holding an anemone in each claw. Yisrael Schnytzer hide caption
Geckolepis megalepis can shed its skin and scales — the largest of any gecko — in order to flee a predator. PeerJ hide caption
A neighborhood in the eastern part of New Orleans where a tornado touched down on Tuesday. Tornadoes destroyed homes and injured dozens of people in the city. Sean Gardner/Getty Images hide caption
Hans Rosling gives a presentation on global population at a conference in Oxford, England, in 2012. Matthew Lloyd/Getty Images for ReSource 2012/Getty Images hide caption