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Comet Kohoutek (formally designated C/1973 E1 and formerly as 1973 XII and 1973f) [c] is a comet that passed close to the Sun towards the end of 1973. Early predictions of the comet's peak brightness suggested that it had the potential to become one of the brightest comets of the 20th century, capturing the attention of the wider public and the press and earning the comet the moniker of "Comet ...
The MIT Radiation Laboratory launched a project to develop microwave detector diodes, focusing on silicon, which had the best detecting properties. [8] By about 1942 point-contact silicon crystal detectors for radar receivers such as the 1N21 and 1N23 were being mass-produced, consisting of a slice of boron -doped silicon crystal with a ...
San Francisco, [23] officially the City and County of San Francisco, is a commercial, financial, and cultural center within Northern California.With a population of 808,988 residents as of 2023, [14] San Francisco is the fourth-most populous city in the state of California and the 17th-most populous in the United States.
[177] [182] According to the U.S. Census Bureau, between 2021 and 2022, 818,000 California residents moved out of state [183] with emigrants listing high cost of living, [184] high taxes, [185] [186] and a difficult business environment as the motivation. [186] The net loss of population in California between July 2020 and July 2023 was 433,000 ...
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