The Girl Who Lit A Flashlight With Her Hand
Can your body power a flashlight?
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The story
Ann Makosinski heard that a friend in the Philippines could not study after dark. At 15, in Canada in 2013, she built a flashlight powered only by the warmth of a hand, using the difference between body heat and cool air to make electricity.
What you'll learn
- A temperature difference can be turned into electric current.
- Your hand is warmer than the air, and that gap is enough to power an LED.
- Ann's hollow flashlight needed no batteries at all.
- Kid takeaway: caring about someone's problem is where invention starts.
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