A view from the Shark Valley Visitors Center in Everglades National Park. Much of the freshwater that used to replenish South Florida's saw grass prairie has been diverted to agriculture, researchers say. Pietro Valocchi/Flickr hide caption
A startup called Opternative offers online vision tests using a computer and a smartphone. Coutesy of Opternative hide caption
A startup called Opternative offers online vision tests using a computer and a smartphone. Coutesy of Opternative hide caption
"As a farmer," says Will Dickinson, "I want to stay in business." He plans to vote next month to stay in the EU, in part because of the farm subsidies he receives from the European Union. Lauren Frayer/NPR hide caption
A view from the Shark Valley Visitors Center in Everglades National Park. Much of the freshwater that used to replenish South Florida's saw grass prairie has been diverted to agriculture, researchers say. Pietro Valocchi/Flickr hide caption
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