Innovative lightbulb made from a coke bottle filled with water and bleach! Water and bleach in bottle of coke was fitted on the roof. It absorbs and reflects sunlight and is equal to a 55 watt lightbulb.
Craft DIY :: Flashlight made from coke can and cereal box :: upcycle - Sas, what about showing this to your dad? It'd be a crazy project to attempt together and I'm afraid it's a bit beyond my own scope.