Who has the time for batteries these days?
Ann Makosinski, a 15-year-old high school student from Victoria, British Columbia, designed a flashlight that's powered entirely by body heat — specifically, heat produced from the palms of your hands.
The device, which she calls "hollow flashlight," uses Peltier tiles to transform hand warmth into usable — and battery-free — energy. A typical light beam can last up to 20 minutes once it's produced.
