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It's one thing to track your heart rate, pulse or other movements with a smart watch or other consumer electronics, researchers say, but quite another to rely on the device to diagnose a disease. martin-dm/Getty Images hide caption

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Like It Or Not, Personal Health Technology Is Getting Smarter

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Musi, an African elephant, is one of Fresno Chaffee Zoo's five elephants enrolled in the Elephant Welfare Initiative. Courtesy of the Fresno Chaffee Zoo hide caption

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Courtesy of the Fresno Chaffee Zoo

Fitness Trackers Aim To Improve The Health And Happiness Of Zoo Elephants

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A Fitbit Saved His Life? Well, Maybe

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In the current version of the Fitnet App, the camera of an exerciser's smartphone captures data from him (upper left), while a prerecorded trainer guides him through a workout. A clock (bottom center) shows elapsed time. The orange dots (upper left) indicate he's following her routine well, as judged by the camera and phone's app. The app can also estimate the exerciser's number of steps. Courtesy of FitNet hide caption

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Courtesy of FitNet

Fitbit stock begins trading publicly Thursday. The Fitbit Force is shown at the 2014 International CES, the consumer technology trade show, in Las Vegas. Justin Sullivan/Getty Images hide caption

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As Fitbit Goes Public, It Will Have To Outrun Competition

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