Water. All my life it came out of a tap every time I turned the knobs on the kitchen sink or wanted a hot shower. It always worked that way, always would. I was an otherwise science-and-planet-aware, touchy-feely tree-hugger type, but took water for granted for thirty years. I confess this. I swam in pools full of the stuff whose existence in this world began the second it left the nozzle of the garden hose or kitchen faucet. This was true until I found water 1981.