Wake Forest University physicists have developed a "Power Felt" fabric that doubles as a spare outlet. When used to line a shirt, for example, it converts subtle differences in temperature into electricity. The technology could be used to power up devices, including MP3 players and cell phone batteries. According to the fabric’s inventor, a cellphone case lined with the material could use the heat absorbed from a pant pocket to boost a device's battery charge by 10 to 15 percent over eight hours.

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