The Transistor (1947)

The transistor, invented at Bell Labs in 1947 by Bardeen, Brattain, and Shockley, is the single most potent enabler of modern electronics, directly powering every device in the digital age. It replaced bulky, power-hungry vacuum tubes, shrinking a room-sized computer into a device that fits in your pocket. By 2024, over 2.9 trillion transistors are manufactured every second, and a single iPhone 15 Pro contains 19 billion—more neurons than the human brain. Outproducing Writing by over 10^22 units annually, the transistor is the most manufactured artifact in history. It underpins integrated circuits and AI, enabling exponential computing power at a fraction of the energy cost of vacuum tubes.