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BUT WHAT OF the grand vision of a molecular computer? In our view, the field is still not much closer to pouring a Pentium chip out ofa beaker than it was when Tour and his colleagues envisioned this possibility a quarter century ago. And the attempt to reach this far rout goal has come at a significant cost: a half century of boom -and-bust cycles, with premature announcements of break- throughs attracting money and attention but then slowing the field down when those results and promises had to be walked back.