This month there is an article on the Memristor in IEEE spectrum. Anyone who knows anything about electronics is familiar with the holy trinity of electrical engineering: the resistor, the capacitor, and the inductor. In 1971, Leon Chua of UC Berkeley, predicted that there should be a fourth element: a memory resistor, or memristor. But no one knew how to build one. 37 years later, electronics have finally gotten small enough to create this device. Hewlett-Packard researchers revealed in the journal Nature (subscription required) that it was hiding within the electrical characteristics of nano-scale devices.
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