The evolution of exoskeletons, hanging on the wall at Ekso Bionics in Richmond, Calif. Peter Earl McCollough for NPR hide caption

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You have to pay to play as Scarlett Fox, a character in the mobile game Temple Run. Imangi Studios hide caption
Captive Market: A Consultant, His Girlfriend And The Kidnapping Business
A bus travels through downtown Tegucigalpa, Honduras. Meridith Kohut/Bloomberg via Getty Images hide caption
Chief Agent Jerry Flowers' says good guys "wear white hats." Nick Oxford for NPR hide caption
Ricky's employee, George Lanes, shows off one of this year's hottest costumes, Anna, from the movie Frozen. Quoctrung Bui/NPR hide caption
Pirates, Princesses, Witches And Vampires: Stocking Costumes Is Serious Business
"They'd get the debt. They'd get people on the phone. They'd start dialing, and start collecting." iStockphoto hide caption
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Screen shot of the mobile game Candy Crush Saga. Screen shot of Candy Crush Saga hide caption
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Bedbugs, Lava And Bowling Balls: Inside My Homeowners Insurance Policy
Union soldiers found that gunpowder was sometimes mixed with sawdust. Mathew B. Brady/AP hide caption
Medical workers in Monrovia, Liberia, put on their protective suits before treating Ebola patients Dominique Faget/AFP/Getty Images hide caption
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Will Davidson and his Minecraft creation, modeled off the Santa Cruz Mission Steve Henn hide caption
The New England Aquarium traded 800 mackerel for 12 puffins. OnceAndFutureLaura/Flickr hide caption
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Shawn Hector and Steve Deutsch hope to invent a chicken coop that can protect chicks like this one. Ana Rodríguez Carrington/Flickr hide caption