William James Sidis
American child prodigy (1898-1944)
United StatesSummary
Updated 2026-05-29
Child prodigy who lectured on four-dimensional geometry at 12 and finished Harvard by 16. Sidis became the poster child for intellectual excess in early 1900s America, then largely vanished from public view.
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William James Sidis was an American child prodigy whose exceptional abilities in mathematics and languages made him one of the most famous intellectual prodigies of the early 20th century. Born to Boris Sidis, a prominent psychiatrist, and Sarah Mandelbaum Sidis, a physician, Sidis demonstrated extraordinary intellectual capabilities from infancy. Enrolled at Harvard University at age 11, he delivered a widely publicized lecture on four-dimensional geometry at age 12 and graduated cum laude in 1914 at 16.
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Stable39.8
Composite of search demand, mentions, audience & graph footprint.
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Momentum2.0
Historical21.3
Source confidence65.0
Completeness75.0
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- Pantheon 2.0High confidencedatabase · pantheon.world
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