Jack Ganssle over at the EE Times has penned an excellent history of the Transistor. Nothing has had a bigger impact on human knowledge and accomplishment. You probably have over 500,000 in your pocket right now.
What is a transistor? It's just a switch, as in on and off. These two states are where binary logic comes from (1s and 0s). But there's more! It also amplifies signals like music from your radio or iPod.

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