Currently, millions of Filipinos live without any kind of light source at all, but a band of resourceful MIT students have begun changing that. The students found that a one liter plastic bottle filled with bleach water and installed on top of a metal roof is a surprisingly simple way to light homes that have neither electrical connectivity nor natural lighting. The plastic defracts light and pushes it to every corner of a small slum house instead of beaming it onto one area like a typical lamp might. As part of their Solar Bottle Project, the organization Isang Litrong Liwanag, which means "A Liter of Light," has already installed 10,000 of these ridiculously basic but amazing lamps throughout Manila.