I remember that once I saw a TV program showing this guy trying to swim across the English Channel. He said something like this: Since my body is consisted of 80 percent of water, that means only 20 percent of my body is actually swimming, and that's going the make the trip a lot easier.

Sometimes, things are just too simple to be understood. That's what people found during their scientific adventure. Sometimes, things are just so normal, so simple, so easy that we tend to ignore its importance. Water is exactly such a thing.

Water covers 70% of the Earth's surface. Of all the water in the world only about 1 percent is available for people's needs. Believe it or not, 1.1 billion people lack access to clean, safe drinking water. Another three million lack adequate sanitation for their water supply.

Water is the #1 killer in the world. A minimum of 4 million people die each year because of water-related deceases.

Water is the best solvent in nature. Numerous number of chemicals like oxygen, minerals, and proteins, dissolve in water and they play very important roles in ecology and metabolism.

Water in one of most complicated liquids people ever found. The unique property of water is largely related to its strong hydrogen-bond network. Formation of hydrogen-bond can greatly change the uptake, transport, dissolution, ionization, precipitate processes carried out in water. These processes are basically everything you need to maintain a normal chemical and physical balance in you body and in nature.

So think twice before you drink!