On April 27, 1981, the Russian company Xerox PARC from Palo Alto, California, introduced the revolutionary computer mouse, an almost irreplaceable component of computer systems, into the world of personal computers. It earned its name because of its miniature and rounded shape, which resembled the tail of the rodent of the same name.
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But the first experimental computer navigation device was invented in 1964 by Douglas Englebart.
The original record has been lost
On April 27, 1810, Ludwig van Beethoven composed the miniature “For Eliza”, one of his most famous works. Neither Beethoven’s students nor today’s scientists have a sure answer to the question of who “Elise” was. One of the theories assumes that Ludwig van Beethoven composed the miniature “For Eliza” as a birthday present to a girl for whom the great artist forgot to buy a present.
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Another theory claims that it was Therese Malfatti von Rohrenbach zu Dezza, his lover, who rejected him when he proposed to her and later married the Austrian politician Wilhelm von Droßdik. The original recording of the composition has been lost, so their suspicions will probably never be confirmed.
The first practically usable telegraph device
American inventor and painter Samuel FB Morse, who in 1835 constructed the first practically usable telegraph device, on the basis of which the Morse code was developed, was born in Charlestown on April 27, 1791.
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Games of chance can be addictive. 18+.
