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William James Sidis was born to Jewish immigrants from Ukraine. On April 1, 1898, in New York City. His father, Boris Sidis was a psychiatrist and he was a polyglot. His mother, Sarah was graduated from its School of Medicine. He has got a one sister, Helena Sidis.
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Sidis could read New York Times at 18 months.
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By age 8, he had reportedly taught himself 8 languages (Latin, Greek, French, Russian, German, Hebrew, Turkish, and Armenian) and invented another, which he called Vendergood.
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William set a record in 1909 by becoming the youngest person to enroll at Harvard University.
