Advertisers used to guard their commercials until they aired on TV. Now, advertisers harness the power of Internet virality and release ads before the big game. Frederick M. Brown/Getty Images hide caption

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FBI Director James Comey is one of the federal officials who has said that the growing use of encryption hurts the ability to track criminals. Keith Srakocic/AP hide caption

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UmmaGawd (Tommy Tibajia), a pilot in the Drone Racing League, flies his quadcopter in an abandoned power plant in New York. The Drone Racing League hide caption

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After knee surgery, David Larson, 66, of Huntington Beach, Calif., experienced pain in a calf muscle. His answer to an automated email from the doctor led to the diagnosis and treatment of a potentially dangerous blood clot. Heidi de Marco/Kaiser Health News hide caption

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Comedian and actress Grace Helbig is a star on YouTube. "Having an audience that listens to and resonates with your creative ideas is invaluable," she says. Paul A. Hebert/Invision/AP hide caption

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The Yik Yak app allows users to post anonymous messages, and to read anonymous messages posted in their current location. Ariel Zambelich/NPR hide caption

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