The question of who has the highest IQ in the world doesn't have a universally accepted answer.
Different IQ tests use different scoring systems, and extremely high scores can be difficult to compare directly.
Several people are frequently mentioned in discussions of exceptional
IQ scores, including mathematician Terence Tao, writer Marilyn vos Savant, physicist Christopher Hirata, physician Sho Yano, and others.

What Does an IQ Test Measure?
IQ assessments generally examine particular cognitive abilities, such as:
Logical reasoning
Pattern recognition
Problem solving
Memory
Verbal reasoning
Is IQ the Same as Overall Intelligence?
Not necessarily.
A test score doesn't fully capture creativity, emotional intelligence, communication, practical intelligence, motivation, or specialized expertise.
This is why a high IQ should be viewed as one indicator of cognitive ability, rather than a complete measure of a person's intelligence or potential.
Why Are the Highest Scores Controversial?
At the extreme upper end, different tests and historical scoring systems can produce results that aren't directly comparable. Some reported scores also have limited independent verification.
Therefore, lists of the “highest IQs” should be treated as informative rather than definitive scientific rankings.
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