A LONG L OF CELLS
Lewis Thomas has a theory that mankind is "going through the early stages of a species' adolescence. If we can. ..shake off the memory of this century. . . we may find ourselves off and running again." His optimism stems from the "high probability that we derived, originally, from some single cell." From "that first micro- organism, parent of us all," man's development has mirrored the process that creates each of our bodies, with myriad cells replicat-...