Technically, when doing something nice for another person you’re not supposed to think about what’s in it for you. Yet it turns out putting others first is one of the kindest things you can do for yourself. In “The Biology of Kindness: Six Daily Choices for Health, Well-Being, and Longevity,” Harvard’s Immaculata De Vivo and co-author Daniel Lumera explore the scientific evidence that prosocial behavior can unlock longer, healthier, happier lives. We asked De Vivo — who holds posts at Radcliffe, the Medical School, and the Chan School of Public Health — to help us develop the following quiz based on her book.

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