Employees of the International University of Florida analyzed the data of hundreds of families from 10 US cities for 1991-2007. 715 children aged 10 and 15 years tested for intelligence. The results of the participants' tests were compared with the results of their best friends at the age of 10-11.

The researchers found that IQ volunteers at the age of 15 strongly depended on the intelligence level of their best friends at age 11.

The higher the intelligence level of a best friend in 11 years, the smarter the participant at the age of 15. Experts took into account the factors that could affect the results.

Scientists emphasize: it's not that the children chose their friends with a similar level of intelligence. According to the research, friends had a significant influence on IQ. According to researchers, a childhood friend can make a person study harder. In addition, a smart friend can learn skills.

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