In the present paper published data and new analyses are presented and discussed in order to demonstrate the power of family data (siblings and parents to military conscripts with IQ data) in the study of the Flynn effect (FE). In particular. it is shown how studies of the mean intelligence changes in sibships of different sizes and changing proportions of sibship sizes can enhance ou... https://allfixelectricales.shop/product-category/splice-crimp-connector/