You’re seeing the story on your screen right now thanks to tiny switches known as transistors. The microchips in computers contain billions of them, each one sending electrical signals based on what you want the computer to do.

Microelectronics like these have become both essential and amazingly minuscule in the push to extract more computing power from less space. A single red blood cell dwarfs today’s average transistor, which is about a thousand times smaller.

That’s still not quite small enough.

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