The Bodybugg is like having a personal trainer strapped to your triceps. The 2.9-ounce gadget uses four sensors to calculate your energy expenditure with 92 percent accuracy&8212;on par with in-the-lab measurements. An accelerometer tracks your movement; two thermometers gauge body
temperature (one's for your core, the other for skin); and a
galvanic-skin-response sensor measures sweat. Upload the data to bodybugg.com, and the site will chart your daily calorie burn against your intake. $500
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Inside NASA's astronaut bootcamp and the grueling new training regimen for deep space. Plus, ten young geniuses shaking up science today, one writer's quest to analyze every man-made chemical in her body and more.
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true video "All about Bodybugg"
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