It is both simple and complex.
Each molecule comprises just three atoms
- two of hydrogen and one of oxygen. Yet, scientists still do not fully understand how water molecules work. What we all know, though, is that water is essential to life, making up about 80 percent by weight of all living things. Consider just five attributes of this amazing substance...
http://www.scienceray.com/Chemistry/Water-is-an-Enigma.580233
