Without the one knowing about the other, Jack Kilby from Texas and Robert Noyce from California invented the integrated circuit in 1958. However, their idea is not new - Briton GW Dummer had suggested such a design in 1952.
Grenades were invented in China over 1,000 years ago.
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In 1926 in Scotland, John Logie Baird demonstrated a machine that transmits movie pictures using radio technology, calling it a "televisor." It was based on a 1884 idea by German Paul Nipkow. At the same time, Philo Fansworth was toiling away in San Francisco on his concept for television. The two men met a few months later, and Baird had to agree that Farnsworth's electronic design was the better. They weren't the only ones working on a TV model, though. Vladmir Zworykin, a Russian immigrant to New York, was working on athode-ray tubes, with the backing of David Sarnoff, the tech-savvy marketer who started NBC. In 1928, Farnsworth's television sets made it to the market first, at $75 a piece.
Gray invented the first electronic musical instrument. He had accidentally discovered that he could control sound from a self-vibrating electromagnetic circuit and in doing so invented a basic single note oscillator. The "Musical Telegraph" used steel reeds whose oscillations were created and transmitted over a telephone line by electromagnets. At the same time, around 1874, Bell had also designed an experimental "Electric Harp" for speech transmission over a telephone line using similar technology to Gray's.