The “their biology makes them do it” hypothesis concerning the oft-horrid behavior of today’s teens keeps on rolling along, charming parents of said teens into the comforting belief that said behavior has absolutely nothing to do with their parenting. The most recent example appeared as an Oct. 16, 2013, Wall Street Journal article that reviewed a study recently published in the journal Developmental Psychology. It’s now clear, says said article, that “the brain regions that support social cognition” — those that support the development of empathy — “continue to change dramatically” during the teen years.