He's not checking your blood glucose levels. He's playing Words with Friends. Anna Zielinska/iStockphoto.com hide caption

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Popular online games like FarmVille use powerful reward systems to get players to spend real-world money on virtual items. Zynga/AP hide caption

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Online Marketers Take Note Of Brains Wired For Rewards
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How many calories in that bite? My Fitness Pal and other fitness and nutrition apps can help find the answer. Heather Rousseau/NPR hide caption

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Patients Lead The Way As Medicine Grapples With Apps
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Drinks columnist David Wondrich is seen on Esquire's new Talk to Esquire app, which allows users to interact with several of the magazine's columnists through voice recognition. Screengrab via YouTube hide caption

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Speak Up! Advertisers Want You To Talk With New Apps
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University of Washington computer science student Laura McFarlane and her team work on their smartphone app aimed at helping girls being illegally trafficked get help. Sara Lerner/NPR hide caption

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More Than Just Angry Birds, Apps Can Have A Humanitarian Side Too
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Nick d'Aloisio displays his mobile application Summly, which Yahoo recently purchased for a reported $30 million. But the Internet company is killing the app and integrating the algorithm that drives it into its own technology. Matt Dunham/AP hide caption

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While many people look to tax preparation services for help, Tobie Stanger, editor at Consumer Reports, says online tools are often cost-effective. /iStockphoto.com hide caption

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'Consumer Reports' Offers Tips For Doing Taxes Online
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New York City rules will soon permit yellow cab drivers to accept rides through smartphone apps. Richard Drew/AP hide caption

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In New York, Taxi Apps Raise Objections From Competitors
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Cell phone communication can be hacked, tapped or otherwise tampered with. A new app aims to change that. iStockphoto hide caption

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Want To Keep Your Messages Private? There's An App For That
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Lt. Cmdr. Stephen Mannino checks a sailor for skin cancer the old-fashioned way during a screening exam at Naval Amphibious Base Coronado in San Diego. MC2 Dominique M. Lasco/U.S. Navy hide caption

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The iTube platform, left, uses colorimetric assays and a smartphone-based digital reader to detect potential food allergen. A screen capture of the iTube App appears on the right. UCLA hide caption

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