According to the Intelligence Quotient scores, the most intelligent human being that has ever lived is William James Sidis.
He was born in New York on April 1, 1898 and is still considered the person with the highest IQ of all time, with an exceptional (assumed) score of around 200 (just to compare), the IQ of a normal person is around 100 and that of Einstein. The IQ is estimated at 160-190).
From the first months of his life, Sidis showed an incredibly early intellectual development. At six months, young William had already started speaking, at 18 months, he was reading the newspaper and at four, he was already speaking Latin.
The young man was so talented that at the age of eight his math skills were superior to those of his father. Also at this age, he passed the Harvard University admission test, which he was forced to drop out because he was too young at the time. Two years later, however, he was admitted and on June 18, 1914, he graduated with honors in literature.
Despite a diploma in letters, Sidis began to teach three scientific subjects: Euclidean geometry, non-Euclidean geometry and trigonometry.
The situation in his family, however, worsened during this period: the relationship with his father became increasingly strained, but the breaking point was reached when he participated in a workers' demonstration on 1 May 1, 1919 and was therefore arrested.
The news was widely reported and William declared himself a socialist and atheist, while the prosecution imposed eighteen months' imprisonment and a bond of $ 5,000 (paid by his friend Leverett Saltonstall). Thanks to the intervention of his father, who concluded an agreement with the judge, the case was closed. After the event, the parents hospitalized William in a psychiatric clinic belonging to the father, a renowned psychiatrist.
He died of a brain hemorrhage at the age of 46 in 1944.
He is said to speak 40 languages fluently and manages to learn one in three days. While serving his ordinary life, Sidis continued to write: he wrote over 89 newspaper articles under a pseudonym. In the book "Animated world and inanimate world" (1920), he had anticipated the concept of "black hole".
The large number of cover pages at his home suggests that the books discovered represent only a small part of Sidis' total production.
Although Sidis did not contribute greatly to scientific progress or bring about life-changing discoveries, he was undoubtedly intelligent.
As many others have said before me, defining intelligence or intelligence is a very complex task, as there are many types of skills related to this subject.
Therefore, I thought that the most arbitrary way of answering the question was to base my answer on intelligence quotient scores, supposed to give an idea of intelligence, without taking into account personal successes or achievements of an individual.
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