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What did Texas Instruments employee Jack Kilby create today in 1958?

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Answer:

The first functioning integrated circuit.

Several executives, including former TI Chairman Mark Shepherd, gathered for the event on September 12, 1958. What they saw was a sliver of germanium, with protruding wires, glued to a glass slide. It was a rough device, but when Kilby pressed the switch, an unending sine curve undulated across the oscilloscope screen.

source: Texas Instruments