The power of the sun is harnessed using a bottle full of ... through holes in the roof, and in full sun they put out the equivalent of a 50 watt incandescent light bulb. Our first thought is ...

The project has helped 690,000 people worldwide. Father and son show off breakthrough technology using 2 common household items: 'Literally a light bulb moment' first appeared on The Cool Down.

If you don't drink wine, there are glass water bottles that you can use. However, if they're clear bottles, they'll emit brighter light in the room. Darker-colored glass bottles like green ...