In Selfish Reasons to Have More Kids, contrarian economist Bryan Caplan argues that we've needlessly turned parenting into an unpleasant chore, and don't know the real plusses and minuses of having kids. Parents today spend more time investing in their kids than ever, but twin and adoption research shows that upbringing is much less important than we imagine, especially in the long-run. Kids aren't like clay that parents mold for life; they're more like flexible plastic that pops back to its original shape once you relax your grip. These revelations are wonderful news for anyone with...