When oxygen and hydrogen find one another, their joining produces fiery passion. Out of this fire, water is born. Quaint Victorian chemistry gives us an image of one oxygen and two hydrogen atoms in a fixed molecule that bounces around from place to place. The reality of water is not so orderly. The hydrogen atoms are not owned by any particular oxygen atom. Water is a substance very much in love with itself, and the atoms connect in webs and clusters where oxygen shares around the hydrogen atoms freely, a fluid situation indeed.