* Lead exposure and crime. Fascinating.
* Beate Gordon obituary. Also fascinating. (Hat tip to Elizabeth Saunders.)
* Who believes in genetic explanations? Liberals or conservatives? It depends!
* Very few counties flipped between the 2008 and 2012 presidential elections. The exact number is a 100-year low, and this is consistent with Andy’s finding that year-to-year variation in state election outcomes is declining.
* The debate about polls and polling averages.