Via Fast Company: Students at MIT, in an effort to design lighting solutions for homes not connected to the grid, developed this brilliant new “lightbulb,” made only of a used plastic bottle, water and bleach.
The simple technology can be installed in less than an hour, lasts for five years, and is equivalent to a 60-watt bulb. It works simply: The water defracts the light, letting it spread throughout the house instead of focusing on one point. The bleach keeps the water clear and microbe-free.
Watch the video on how this works here