FILE - A smoker demonstrates an e-cigarette at Vape store in Chicago, April 23, 2014. A new study found that toxicity levels of e-cigarettes can fluctuate with the temperature, type and age of the device, a new study has found.

    E-Cigarettes Found More Harmful Than Thought

    Toxicity levels of electronic substitutes can fluctuate with temperature, type and age of device, new study finds

    (Photo by Flickr user Global Panorama via Creative Commons License)

    One Hour of Exercise a Day Offsets Damage of Sitting 8 Hours

    Lack of activity is also linked to some 5.3 million deaths each year, even more than smoking

    FILE - Surgeons use the robot da Vinci to aid a hernia operation, at the University Hospital Geneva, in Geneva, Switzerland, Nov. 13, 2008.

    New Crop of Robots to Vie for Space in Operating Room

    Developers of next generation of robots aim to make them less expensive, more nimble and capable of performing more types of procedures

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