By SETH BORENSTEIN AP Science WriterActs of kindness may not be that random after all. Science says being kind pays off.Research shows that acts of kindness make us feel better and healthier. Kindness is also key to how we evolved and survived as a species, scientists say. We are hard-wired to be kind.Kindness is as bred in our bones as our anger or our lust or our grief or as our desire for revenge, said University of California San Diego psychologist Michael McCullough, author of the forthcoming book Kindness of Strangers. Its also, he said, the main feature we take for granted.Scientific research is booming into human kindness and what scientists have found so far speaks well of us.Kindness is much older than religion. It does seem to be universal, said University of Oxford anthropologist Oliver Curry, research director at Kindlab. The basic reason why people are kind is that we are social animals.We prize kindness over any other value. When psychologists lumped values into ten categories and asked people what was more important, benevolence or kindness, comes out on top, beating hedonism, having an exciting life, creativity, ambition, tradition, security, obedience, seeking social justice and seeking power, said University of London psychologist Anat Bardi, who studies value systems.Were kind because under the right circumstances we all benefit from kindness, Oxfords Curry said.When it comes to a species survival kindness pays, friendliness pays, said Duke University evolutionary anthropologist Brian Hare, author of the new book Survival of the Friendliest.Kindness and cooperation work for many species, whether its bacteria, flowers or our fellow primate bonobos. The more friends you have, the more individuals you help, the more successful you are, Hare said.For example, Hare, who studies bonobos and other primates, compares aggressive chimpanzees, which attack outsiders, to bonobos where the animals dont kill but help out strangers. Male bonobos are far more successful at mating than their male chimp counterparts, Hare said.McCullough sees bonobos as more the exceptions. Most animals arent kind or helpful to strangers, just close relatives so in that way it is one of the traits that separate us from other species, he said. And that, he said, is because of the human ability to reason.Humans realize that theres not much difference between our close relatives and strangers and that someday strangers can help us if we are kind to them, McCullough said.Reasoning is the secret ingredient, which is why we donate blood when there are disasters and why most industrialized nations spend at least 20% of their money on social programs, such as housing and education, McCullough said.Dukes Hare also points to mama bears to understand the evolution and biology of kindness and its aggressive nasty flip side. He said studies point to certain areas of the brain, the medial prefrontal cortex, temporal parietal junction and other spots as either activated or dampened by emotional activity. The same places give us the ability to nurture and love, but also dehumanize and exclude, he said.When mother bears are feeding and nurturing their cubs, these areas in the brain are activated and it allows them to be generous and loving, Hare said. But if someone comes near the mother bear at that time, it sets of the brains threat mechanisms in the same places. The same bear becomes its most aggressive and dangerous.Hare said he sees this in humans. Some of the same people who are generous to family and close friends, when they feel threatened by outsiders become angrier. He points to the current polarization of the world.More isolated groups are more likely to be feel threatened by others and they are more likely to morally exclude, dehumanize, Hare said. And that opens the door to cruelty.But overall our bodies arent just programmed to be nice, they reward us for being kind, scientists said.Doing kindness makes you happier and being happier makes you do kind acts, said labor economist Richard Layard, who studies happiness at the London School of Economics and wrote the new book Can We Be Happier?University of California Riverside psychology professor Sonja Lyubomirsky has put that concept to the test in numerous experiments over 20 years and repeatedly found that people feel better when they are kind to others, even more than when they are kind to themselves.Acts of kindness are very powerful, Lyubomirsky said.In one experiment, she asked subjects to do an extra three acts of kindness for other people a week and asked a different group to do three acts of self-kindness. They could be small, like opening a door for someone, or big. But the people who were kind to others became happier and felt more connected to the world.The same occurred with money, using it to help others versus helping yourself. Lyubomirsky said she thinks it is because people spend too much time thinking and worrying about themselves and when they think of others while doing acts of kindness, it redirects them away from their own problems.Oxfords Curry analyzed peer-reviewed research like Lyubomirskys and found at least 27 studies showing the same thing: Being kind makes people feel better emotionally.But its not just emotional. Its physical.Lyubomirsky said a study of people with multiple sclerosis and found they felt better physically when helping others. She also found that in people doing more acts of kindness that the genes that trigger inflammation were turned down more than in people who dont.And she said in upcoming studies, shes found more antiviral genes in people who performed acts of kindness.___Follow Seth Borenstein on Twitter at @borenbears .___The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institutes Department of Science Education. The AP is solely responsible for all content.___Associated Press religion coverage receives support from the Lilly Endowment through the Religion News Foundation. The AP is solely responsible for this content.

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