個author因為政治正確先至寫個咁既conclusion
唔該你睇下內容先post
Adopted, with two black biological parents, age 17 IQ = 89
Adopted, with one white and one black biological parent, age 17 IQ = 99
Adopted, with two white biological parents, age 17 IQ = 106
Non adopted, with two white biological parents, age 17 IQ = 109
https://en.wikipedia.org/wiki/Minnesota_Transracial_Adoption_Study