Assignment no. 2 Invention due to necessity

This video shows a simple idea and the revolutionary lamps made of water! Because of too much electric consumption, this idea was created by a brazilian mechanical Mr. Alfredo Moser, one common person that can show how consumers should be converted to inventors of a new world that is possible.

The full story:

The most practical invention for lighting dark unlit rooms comes from inventor mechanic Mr. Alfredo Moser with his water light bulbs.
He notices that two clear two-liter bottles refract the sun very brightly when the bottles are filled with water.
So he decided to save on his electric bill. Mr. Moser cut holes in the ceiling of his mechanic auto shop, and sealed in the two liter bottles of water.
The result is the sun greatly brightened his workspace through the refracting water and bottle plastic in rooms that have not windows.
Mr. Moser says that chloride (about two bottle caps worth) will keep bacteria from clouding up bottle.

Source:
http://sustainable.rain-barrel.net/water-light-bulbs/