IMAGINE TRYING TO live in a world dominated by dihydrogen oxide, a compound that hasno taste or smell and is so variable in its properties that it is generally benign but at othertimes swiftly lethal. Depending on its state, it can scald you or freeze you. In the presence ofcertain organic molecules it can form carbonic acids so nasty that they can strip the leavesfrom trees and eat the faces off statuary. In bulk, when agitated, it can strike with a fury thatno human edifice could withstand. Even for those who have learned to live with it, it is anoften murderous substance. We call it water.

Water is everywhere. A potato is 80 percent water, a cow 74 percent, a bacterium 75percent. A tomato, at 95 percent, is little but water. Even humans are 65 percent water,making us more liquid than solid by a margin of almost two to one. Water is strange stuff. It isformless and transparent, and yet we long to be beside it. It has no taste and yet we love thetaste of it. We will travel great distances and pay small fortunes to see it in sunshine. Andeven though we know it is dangerous and drowns tens of thousands of people every year, wecan’t wait to frolic in it.

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