The Feel-Good Genehttp://www.nytimes.com/2015/03/08/opinion/sunday/the-feel-good-gene.html?hpw&rref=opinion&action=click&pgtype=Homepage&module=well-region®ion=bottom-well&WT.nav=bottom-well by sew • 11 years ago 1 0 11 years agoNYnytimes.com