A recent study on data from a dating app found all women except black women were most drawn to white men, and men of all races (with one notable exception) prefer Asian women. iStockphoto hide caption

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Andres Quiroz, an installer for Stellar Solar, carries a solar panel during installation at a home in Encinitas, Calif. Sam Hodgson/Bloomberg via Getty Images hide caption

itoggle caption Sam Hodgson/Bloomberg via Getty Images

A screenshot of Half the Sky, where virtual successes sometimes lead to real-life donations. Games For Change hide caption

itoggle caption Games For Change

Customers at Honeygrow in Philadelphia can charge their cellphones while they dine using one of Doug Baldasare's kiosks. Emma Lee/For NewsWorks hide caption

itoggle caption Emma Lee/For NewsWorks

Health and Human Services Secretary Kathleen Sebelius visits navigators helping enroll people on HealthCare.gov. Lynne Sladky/AP hide caption

itoggle caption Lynne Sladky/AP

Dee Faught tests a robotic arm installed on his wheelchair in September. Commercially produced robotic arms can cost tens of thousands of dollars, but three Rice engineering students built one for Dee for about $800. Eric Kayne for NPR hide caption

itoggle caption Eric Kayne for NPR

A Welsh man has realized that he threw out a stash of Bitcoins along with an old computer hard drive. At an exchange rate hit today, they would be worth around $7.5 million. Here, a photo of tokens representing Bitcoins. Rick Bowmer/ASP hide caption

itoggle caption Rick Bowmer/ASP