In 2013, a 16-year-old Canadian high school student created the Hollow Flashlight, a flashlight that converts body heat into light without any batteries or kinetic energy. She was deeply moved when she learned that a friend in the Philippines had problems at school: there was no light at night, the only time she was free to do her homework.
Ann spent just $26 on her prototype materials, and she aims to provide her gadget for free to people in developing countries.
