Researchers at Kings College London looked at scored over 64 years . They found that the average score of a child born in 1900 was about 100 points higher than those who were born between 1910 and 1920, but this difference disappeared by age 40 for both groups. Since 1950 , average intelligence was found to rise by about 20 IQ points . Explanations include better education and improved medical care .
Researchers at Kings College London looked at scored over 64 years . In total , more than 200,000 participants in IQ tests were studied . Since 1950 , average intelligence was found to rise by about 20 IQ points . Explanations include better education and improved medical care .