Face it, batteries just aren't very reliable, I type with gritted teeth as I spy the rapidly dwindling battery power indicator on my MacBook. And, as we learned recently, lithium-ion batteries have a tendency to overheat, triggering expensive recalls from Nokia and Sony in the past year. Perhaps the researchers at Germany's Fraunhofer Institute, the same group that brought us the MP3 audio format, have found a solution: a new method of drawing electrical current from our body heat that could some day power laptops, mobile phones and gadgets.
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