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This is Scientific American's 60-Second Science. I'm Cynthia Graber. This will just take a minute.

Do you come from a country that has, let's say, a history of environmental disasters or conquests? Then your culture is probably "tight"—it has strong social norms and doesn't tolerate much deviance from those norms. And your society is probably autocratic with few political and civil liberties. Or, a happier history probably led to your culture being "loose," with more rights and openness. So says a study in the journal Science.

Researchers surveyed almost 7,000 people in 33 countries. They asked respondents to scale the truth of statements such as, "In this country, if someone acts in an inappropriate way, others will strongly disapprove¹." Participants also rated the acceptability of activities such as kissing in public.

Then the researchers correlated those answers with current and historical data about ecological² and societal threats, population density³, even the prevalence of diseases. They found that the more stresses a society has faced—whether ecological or human-made—the more likely that culture is to be a tight one.

The scientists say that its threat history could explain why a given culture finds others to be alien or immoral⁴. And that appreciating the roots of cultural differences could improve international communication.

Thanks for the minute. For Scientific American's 60-Second Science, I'm Cynthia Graber.