Water is one of the most unusual substances in the world. H2O seems to be such a simple thing, but at the same time it's probably the most important thing we need to survive. Moreover, scientists agree that the first creatures on Earth also appeared from water. But even though we depend on water, we haven't yet learnt all the secrets it hides from us. And right now we are going to show you how many hazards are bound to such a simple thing as water! Enjoy!