In my own work as a scientist and biological explorer, water continues to take on new meaning. This substance, water, H2O, is really a scientific freak. It has a rare property in that it becomes denser as a liquid than it is as a solid. And in that behavioral property is the reason for life on Earth. The whole planet would be a ball of ice.
Water is the only substance occurring naturally in solid, liquid, and gaseous states.
In time it can dissolve any other substance on the planet. It is made up of two abundant elements, hydrogen and oxygen. One burns, the other aids combustion. Together they quench our thirst and douse our fires. Apparently, no one has ever seen a water molecule.