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For most of the year, Provincetown, Massachusetts, on the northern tip of Cape Cod, has around three thousand residents. In summertime, however, it becomes a vacation destination and gay mecca. [...]

In 1988, Richard Lenski, a thirty-one-year-old biologist at UC Irvine, started an experiment. He divided a population of a common bacterium, E. coli, into twelve flasks. Each flask was kept at [...]