Darwin is associated, in the popular imagination, with bloody zero-sum competition, with Tennyson’s “nature, red in tooth and claw”—with the motto “survival of the fittest.” But this wasn’t actually his phrase. It was coined by a philosopher and sociologist named Herbert Spencer and his fellow “social Darwinists,” who were promoters of white and upper-class supremacy. For Darwin, says Keltner, “survival of the kindest” would have been a better moniker. Darwin was a gentle and melancholic soul, a doting husband and adoring father of ten, deeply in love with nature from earliest childhood.

