Every time I go to the dentist, I spend all my waiting room time gazing at the office aquarium. The quiet hum and movement of sea creatures calms me instantly. On a recent visit, however, when I arrived at the dentist’s waiting room there was no soothing, motorized hum, instead, I found someone working on the aquarium. This man was lovingly scrubbing at some of the unwanted algae, and scooping up various bits of God knows what from crevices in the coral.