“One of the cornerstones of Keltner’s research, which he summarized in his book Born to Be Good, is what he calls “the compassionate instinct”—the idea that we humans are wired to respond to each other’s troubles with care. Our nervous systems make little distinction between our own pain and the pain of others, it turns out; they react similarly to both. This instinct is as much a part of us as the desire to eat and breathe.”