Brain Differences by Socioeconomic Status
In some circles, discussing the effects of how kids are raised is taboo because (among other reasons) there's a concern that it will emphasize differences that reinforce stereotypes. These fears are not unjustified, but sometimes you read studies like this, and you really start to think that we need to understand these issues.
(Disclaimer: the article is, in typical journalistic style, rather more alarmist than is warranted.)