ABSTRACT
Life is a series of experiences—some we want to repeat, and some we’d like to forget. Perhaps things like this have happened to you:
You walked wearily through an endless hall in a natural-history museum, searching in vain for a bench.
You were having a great time at an art museum’s restaurant—you got wonderful food and warm service in a fun atmosphere—and then you found a dirty bathroom with a cracked, drippy sink.
A salesclerk’s sour attitude ruined your experience in a national park store, even though they had fantastic merchandise.
Or maybe you sat down at a computer in a library to find a grimy keyboard and a sticky mouse.
