
Note: Einstein's estimated IQ of 200 was cited by Amy Wallace in her biography of William James Sidis
I highly recommend: The Prodigy: A Biography of William James Sidis, America's Greatest Child Prodigy by Amy Wallace:
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William J. Sidis’ IQ was estimated to be 250 - 300, according to Abraham Sperling, director of New York City's Aptitude Testing Institute
Einstein color photo: DonkeyHotey, CC BY 2.0 via Wikimedia Commons
Fourth dimensional cube: JasonHise at English Wikipedia, Public domain, via Wikimedia Commons
Sidis Psychotherapeutic Institute: Maplewood Farms, Portsmouth, N.H. (Public Domain)
Jim Evans, CC BY-SA 4.0 via Wikimedia Commons
John Phelan, CC BY 3.0 via Wikimedia Commons
Myotus, CC BY-SA 4.0 via Wikimedia Commons