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At any moment, we are either in a divergent phase of life, or in a convergent phase. During a divergent period, we’re usually focused on broadening our inputs. We go to school, take on internships, travel, try a career switch, and so on, exploring new paths. During a convergent time, we take what we’ve learned thus…
The world with its quarks and chromosomes, its distant lands and spiral nebulae, is like a vast computer in a black box, forever sealed except for its input and output registers. These we directly observe, and in the light of them we speculate on the structure of the machine, the universe. Thus it is that we think up…
The great discovery of Bennett and, independently, of Fredkin is that it is possible to do computation with a different kind of fundamental gate unit, namely, a reversible gate unit. I have illustrated their idea--with a unit which I could call a reversible NAND gate. It has thre inputs and thre outputs. Of the…