2. “…exposure to a disruptive peer in classes of 25 during elementary school reduces earnings at age 24 to 28 by 3 percent. We estimate that differential exposure to children linked to domestic violence explains 5 percent of the rich-poor earnings gap in our data,and that each year of exposure to a disruptive peer reduces the present discounted value of classmates’ future earnings by $80,000.” By Carrell, Hoekstra, and Kuka. The size of that effect seems large to me, but worth a ponder in any case.
5. Can tracking your moods with a wrist band stop your suicide? Should we even go down this path?