Water is made from one hidrogen atom and 2 oxygen atoms
water has a static electric charge which makes it cling to things making them wet, and also cling to itself.
Water exists in 3 states, solid, liquid and gas
The boiling point of water where it changes from a liquid to a gas is 100 degrees celcius.
The freezing point of water when it changes form liquid to a solid is zero degrees celcius.
Why so precise? This is because the celcius scale of temperatures are based on the changing states of water.
Humans are about 97% water