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Way back in 1979, the evolutionary biologist Stephen Jay Gould made a case that cuteness is not an arbitrary notion, but a measurable trait that can make people feel protective and nurturing. Scientists have since measured the trait — and even identified how dogs use special facial muscles to make themselves “cute.” Understanding this shouldn’t make us love cute animals any less, but it could motivate us to love the not-so-cute ones more.

Gould’s “Biological Homage to Mickey Mouse” showed that in response to public pressure, the Disney icon gradually developed fatter limbs, a more domed forehead and bigger eyes — all traits suggestive of human babies. Such features in adult humans and other animals — a phenomenon called neoteny — can coax strong emotions from us. Just look at how we baby our dogs.

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