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Today in History: Mensa Founded as World’s Largest High-IQ Society

10/1/2025

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Summary

Story summary

On October 1, 1946, Mensa International was established in the United Kingdom as the largest and oldest high-IQ society. Open to individuals scoring in the 98th percentile on approved intelligence tests, Mensa aims to foster a community for intellectual exchange. It operates through national groups under the umbrella of Mensa International, headquartered in Lincolnshire.

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Story summary

On October 1, 1946, Mensa International was established in the United Kingdom as the largest and oldest high-IQ society. Open to individuals scoring in the 98th percentile on approved intelligence tests, Mensa aims to foster a community for intellectual exchange. It operates through national groups under the umbrella of Mensa International, headquartered in Lincolnshire.