Dutton and Lynn report secular declines in Fullscale IQ evaluated using WAIS of four points a decade in France between the years 1999 and 2008–9. It is posited that the trend may have a partially biological cause, stemming from dysgenic fertility and, to a lesser extent, replacement migration. KALERGI EFFECT.
https://www.sciencedirect.com/science/article/abs/pii/S0160289615001221
Inbreeding also lowers IQ and creates mental and physical handicaps and diseases.
Dutton and Lynn report secular declines in Fullscale IQ evaluated using WAIS of four points a decade in France between the years 1999 and 2008–9. It is posited that the trend may have a partially biological cause, stemming from dysgenic fertility and, to a lesser extent, replacement migration. KALERGI EFFECT. https://www.sciencedirect.com/science/article/abs/pii/S0160289615001221
Inbreeding also lowers IQ and creates mental and physical handicaps and diseases.