There are many errors in the article by Halpern et al. published last week by Science magazine. The point of my essay was to focus on just one category of error, namely the purported harm of single-sex education. I observed that these alleged dangers were based on studies conducted in coed prekindergartens in Tempe, Arizona. The authors assume that they can extrapolate findings from studies in coed prekindergartens to broad statements about the alleged harm of single-sex education - while neglecting studies which actually investigated whether gender is more salient in the single-sex setting or the coed setting.

Diane Halpern, Lise Eliot et al. argue that supporters of single-sex education base that support primarily or entirely on brain research, which is not the case.  Lise Eliot's "reply" to my post "Are Single-Sex Schools Actually Dangerous?" does not even mention, let alone respond to, the main point of my post:  namely, that she and her co-authors based their assertions on the alleged harm of single-sex education entirely on studies conducted in the coed setting, while neglecting studies in which students were randomly assigned either to single-sex classrooms or coed classrooms (e.g. Kessels and Hannover 2008).