Men move more than women do inside an MRI machine

There's a new paper out suggesting that ladies' brains are different from mens' (in ways that support Western stereotypes of gender behavior, natch). It's pretty flawed and has been heavily critiqued, but one critique surprised me — turns out, there's evidence that men tend to move more than women do when you put them in an MRI machine, something that could throw off any attempt to compare MRI data between men and women.