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The highest-ranking state in terms of average IQ is New Hampshire, with an average IQ score of 103.2. The state with the lowest IQ score turns out to be New Mexico, with the IQ score of residents coming to 95.0 on average.

Countries by First Letter World Population Prospects (2024 Revision) - United Nations population estimates and projections.

It is estimated that approximately 50,000 people from the United States are members of Mensa. Other countries that are heavily represented include the United Kingdom, Germany, the Netherlands, Sweden, and Denmark. All of these are European countries, and the United Kingdom has the second most members with about 22,700.

IQ Air, which measures pollution in 109 countries around the globe, considers measurements above 35.5 to be unhealthy for sensitive groups, levels between 55.5 and 150.4 to be unhealthy for all, and anything higher is either very unhealthy (150.5-250.4) or hazardous (250.5 or higher).

Education is the process of acquiring knowledge, skills, values, and attitudes through formal or informal means. This category includes metrics such as literacy rates, enrollment rates, teacher-to-student ratio, and educational attainment. Other metrics like education spending, curriculum quality, and technological readiness are also included.

The Penn Stakes measure of state-level intelligence compiles several intelligence- and education-based metrics: average IQ score; the percentage of a state's population with a high school diploma, bachelor's, or advanced degree; and SAT and ACT scores.

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Health is the state of physical, mental, and social well-being, and not merely the absence of disease or infirmity. This category includes metrics such as life expectancy, infant mortality rate, disease prevalence, and access to healthcare. There are also articles covering abortion, drug use, and vaccination status.