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  1. William James Sidis (/ ˈ s aɪ d ɪ s /; April 1, 1898 – July 17, 1944) was an American child prodigy with exceptional mathematical and linguistic skills, for which he was active as a mathematician, linguist, historian, and author (whose works were published covertly due to never using his real name).

    • Boris Sidis

      Boris Sidis was born on October 12, 1867, in Berdychiv, to...

    • Martha Foley

      Martha Foley (March 21, 1897 – September 5, 1977) cofounded...

    • Polyglot

      The first recorded use of the word multilingual in the...

  2. Dec 17, 2023 · William Sidis took general intelligence tests late in life for civil servants in New York and Boston. His phenomenal ratings are a matter of records. However, Sperling never seems to have given Sidis an IQ test himself to test his IQ.

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    • William James Sidis: A Child Prodigy Like No Other
    • The Unparalleled IQ of William James Sidis
    • The “World’s Smartest Person” Spends His Last Decades in Seclusion

    On April 1, 1898, William James Sidis, the “smartest person who ever lived,” was born in Boston, Massachusetts. His parents, Ukrainian immigrants Boris and Sarah Sidis, were pretty intelligent themselves. Boris was a famed psychologist while Sarah was a doctor. From the start, William James Sidis’ parents adored their gifted son, spending untold mo...

    Much speculation has been made over the years about William James Sidis’ IQ. Any records of his IQ testing have been lost to time, so modern-day historians are forced to estimate. For context, 100 is considered an average IQ score, while below 70 is often viewed as substandard. Anything above 130 is considered gifted or very advanced. Some historic...

    William James Sidis briefly courted controversywhen he was arrested at a Boston May Day Socialist March in 1919. He was sentenced to 18 months in prison for rioting and assaulting a police officer, but he had actually done neither. That said, Sidis was determined to live in quiet solitude after his brush with the law. He took on a series of menial ...

    • Adragon De Mello: IQ 400. When Adragon was only eleven, he graduated from the University of California in Santa Cruz. He earned a degree in computational mathematics and grew up to become a high-tech worker.
    • Marnen Laibow-Koser: IQ 268. Marnen has been composing music since he was three. He is now a professional composer and musician.
    • Ainan Cawley: IQ 263. Ainan was a child genius who enrolled in third-year chemistry courses at Singapore Polytechnic when he was only eight. The next year, at age nine, he memorized 518 decimal places of pi.
    • Marilyn vos Savant: IQ 228. Marilyn has an IQ of 228. She received that score on an IQ test when she was only ten years old. This landed her in the Guinness Book of World Records.
  3. Nov 24, 2021 · Though no scorecards or test reports concerning his intelligence exist today, considering Sidis’ age and academic brilliance, his IQ score is estimated by some to be somewhere between 50 and 100...

  4. Jun 27, 2023 · From William James Sidis' alleged 300 score to Marilyn vos Savant's 228, discover the true stories of the world's smartest people with the highest IQs ever recorded.

  5. Jan 23, 2011 · Born in Boston in 1898, William James Sidis made the headlines in the early 20th century as a child prodigy with an amazing intellect. His IQ was estimated to be 50 to 100 points higher...

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