David Vawter (left), project manager at LPCiminelli and Steve James, senior vice president of Operations at SolarCity, on the roof of the factory in South Buffalo. Joel Rose/NPR hide caption

toggle caption Joel Rose/NPR

Craig Ferris in his office at Wyoming Indian Elementary School in Ethete, Wyo. Ferris spends most of his driving around and knocking on doors on the vast Wind River Reservation. Aaron Schrank/Wyoming Public Radio hide caption

toggle caption Aaron Schrank/Wyoming Public Radio

The number of people being diagnosed with diabetes has been on the decline since 2009. iStockphoto hide caption

toggle caption iStockphoto

That black triangle icon is a sodium warning label next to a dish on the menu at an Applebee's in New York City. Starting Tuesday, the city's Health Department is requiring chain restaurants with 15 or more locations to display the salt shaker icon next to menu items containing 2,300 mg or more of sodium — the recommended daily limit. Jewel Samad/AFP/Getty Images hide caption

toggle caption Jewel Samad/AFP/Getty Images

Cascara is made by brewing dried coffee cherries, which typically would have otherwise ended up as compost. "We have been throwing away this perfectly good coffee fruit for a long time, and there's no real reason for it, because it tastes delicious," says Peter Giuliano, of the Specialty Coffee Association of America. Murray Carpenter for NPR hide caption

toggle caption Murray Carpenter for NPR