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Taxis park along the footpath in Adelaide, Australia. Alva Noe asks: Do taxi apps make people interact less — or better — with their drivers? sasimoto/Getty Images/iStockphoto hide caption

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sasimoto/Getty Images/iStockphoto

Snapchat users can upload photos and videos onto the new Snap Map. When a topic is trending, it'll pop up on a heat map. The image above is a composite of Snapchat screen grabs. Shelby Knowles/NPR hide caption

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Shelby Knowles/NPR

Inside DARPA, The Pentagon Agency Whose Technology Has 'Changed the World'

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Some workers in low-income countries are choosing bitcoin, a virtual currency powered by blockchain technology, to send money to their families. It's cheaper, faster and doesn't require a middleman. Andrew Baker/Getty Images/Ikon Images hide caption

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Andrew Baker/Getty Images/Ikon Images