Thanks to certain recent events, I wanted to have you guys look at an excerpt from Judith Rich Harris's The Nurture Assumption. This is here to serve as a reminder to certain people (you know who you are, if not, don't worry): In Chapter 3 I recounted some stories of identical twins separated in infancy... Read More

Post updated, 9/14/14 6/5/14. See below! In my earlier post on Gregory Clark's work, The Son Becomes The Father, I laid bare the case for the known high heritability of human behavioral traits (including values and attitudes) and life outcomes. As well, equally important, I illustrated the complete absence of shared environment influences on these... Read More

A new study (recently discussed by Steve Sailer) has found that the children of gay and lesbian parents have a lower high school graduation rate than those of straight parents. The finding of this study seems straightforward – indeed, I was able to say it in a sentence. However, the conclusions we are able to... Read More

EDIT, 5/30/15: [Post updated with results of new meta-analyses of behavioral genetic studies. See below!] Edit, 1/3/13: [Post updated to reflect additional information provided in the comments. See below and see the comments.] The time has come for a little reminder of the First Law of behavioral genetics. In my final post of 2012, I... Read More

EDIT: Post updated, 3/17/14. See below! Welcome to my blog! New Blog post #1! So I moved over from Blogger.com because it didn’t allow people to comment without signing in. Why would I want to restrict people that way? So this post is mostly copied from that site with a few changes. This will be... Read More