How did Jack Kilby invent the integrated circuit?
It came from a practical problem. In the summer of 1958, I was a new hire at Texas Instruments, and most of the lab was on vacation. I was left alone to think about the 'tyranny of numbers'—the fact that complex circuits required thousands of hand-soldered connections, which were unreliable and expensive. I realized that if you could make all the components—resistors, capacitors, transistors—out of the same semiconductor material, you could eliminate the wiring. I sketched the idea in my notebook: a single chip of germanium with diffused regions acting as different components. When my colleagues returned, I built a simple oscillator circuit on a sliver of germanium, using gold wires to connect the parts. It worked. The key was understanding the materials—germanium's properties let me create resistors and capacitors alongside transistors. It wasn't a flash of genius; it was just reducing the problem to its simplest form.
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