3/4 of the earth’s surface is filled with water. But these huge amount of water is almost undrinkable. Imagine a world, where there is no water. The water that are left in the world is only in human and animal body. I hope you understand what I mean. If you have to drink water, then you will have no option except drinking your own emerged water. Anyway, that’s a nightmare. I’m sure, no has thought about it in dreams. But, guess what? Microsoft owner Bill Gates is investing his money for making a new machine for transforming toilet water into drinking water. Really?