Mimicking cells with transistors

As the world has become less analog and more digital -- as tape decks and TV antennas have given way to MP3 players and streaming video -- electrical engineers’ habits of thought have changed, too. In the analog world, they used to think mostly in terms of quantities such as voltage, which are continuous, meaning they can take on an infinite range of values. Now, they tend to think more in terms of 0s and 1s, the binary oppositions of digital logic.

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