In many of the world's poor neighborhoods, homes are built out of whatever materials people can get their hands on, often without windows or electricity. That means the buildings are awfully dark during the day, reducing quality of life, safety, and productivity.
But the situation can be improved with only a used soda bottle, some water, and some bleach. Check out this clever solution, developed by MIT and distributed by the Liter of Light project.
Maggie Koerth-Baker is the science editor at BoingBoing.net. She writes a monthly column for The New York Times Magazine and is the author of Before the Lights Go Out, a book about electricity, infrastructure, and the future of energy. You can find Maggie on Twitter and Facebook.