Kelvin Doe is a self-taught engineer from Sierra Leone, West Africa. In his hometown, "the lights come on once in a week, and the rest of the month, dark," the young student told thnkrtv . From metal and wire scraps, he made a battery to "power lights in people’s houses," an FM radio transmitter to disseminate news and a generator to power the device. This year, the young prodigy was invited to MIT as a guest resident by David Sengeh, a . student at the research university's media lab. Doe became the youngest invitee to the Visiting Practitioner’s Program for international development.