![]() Although simple circuits contain individual transistors like this, complex circuits inside computers also contain microchips, each of which might have thousands, millions, or hundreds of millions of transistors packed inside. Photo: An insect with three legs? No, a typical transistor on an electronic circuit board. Invented over half a century ago by John Bardeen, Walter Brattain, and ![]() ![]() Transistors have revolutionized electronics since they were first They're made from silicon, a chemical element commonly found in sand. Your brain contains around 100 billion cells called neurons-the tiny switches that let you think and remember things.
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