A teenager from Canada has come up with a new way to power flashlights, and it doesn't require batteries.
According to CBC News, 16-year-old Ann Makosinski designed what she calls a "hollow flashlight" that transforms the heat from your hand into a source of energy.
"I'm really interested in harvesting surplus energy, energy that surrounds but we never really use," Ann told CBC News.
In order for the flashlight to be powered by body energy, Ann used Peltier tiles -- a device that produces energy when one side is heated and another side is cooled. Apparently, the light can last for about 20 minutes.
