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The (/ ð ə, ð iː / ()) is a grammatical article in English, denoting persons or things already mentioned, under discussion, implied or otherwise presumed familiar to listeners, readers, or speakers.
The speed of light in vacuum, denoted c, is a physical constant that is exactly equal to 299,792,458 metres per second (approximately 186,282 miles per second, or one foot per nanosecond).
Early life. Lewis was born Joseph Levitch on March 16, 1926, in Newark, New Jersey, to a Jewish family. His parents were Daniel "Danny" Levitch (1902–1980), a master of ceremonies and vaudevillian who performed under the stage name Danny Lewis, whose parents immigrated to the United States from the Russian Empire to New York, and Rachael "Rae" Levitch (née Brodsky; 1903–1983), a WOR radio ...