Wristify, a prototype bracelet that delivers thermal pulses to the wrist to raise or lower body temp, "basically puts a personal air conditioner and heater" on your body, said Anthony Domanico at CNET. The wrist is an area of high blood flow, so rapid changes in temperature there "can make you feel several degrees" cooler or warmer. Wristify won't replace ordinary heating and cooling, but if it encourages people to use their ACs a bit less or turn the thermostat one degree lower in winter, the environmental benefits might be big.
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