Serving in the the armed forces is largely determined by genes, with no effect of the home environment. http://journals.sagepub.com/doi/abs/10.1177/0095327X18765449 …pic.twitter.com/NObzDPPN9T
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The major, paradigm-changing conclusion reported in my linked articles was reached completely without twins, but just with siblings. @Race__Realist https://plus.google.com/101046916407340625977/posts/NzThLg3Tz5v …pic.twitter.com/vg1SzlAIrm
https://www.ncbi.nlm.nih.gov/pubmed/23865114 The funny fat is when adoption studies are done properly, ad hoc genetic interpretations are invoked to explain non existant correlations. Suddenly twins method become more appropriate than adoption studies.
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