Hewlett-Packard scientists on April 8 are expected to report advances in the design of a new class of diminutive switches capable of replacing transistors as computer chips shrink closer to the atomic scale, reports the New York Times—and these so-called “memristors,” or memory resistors, could lead to a new class of computing devices. The devices were conceived in 1971 by Leon O. Chua, an electrical engineer at the University of California, Berkeley, but they were not put into effect until 2008 at the HP lab in Palo Alto, Calif. They are simpler than today’s...

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