The issue doesn’t appear to be girls’ aptitude for STEM professions. In looking at test scores across 67 countries and regions, Stoet and Geary found that girls performed about as well or better than boys did on science in most countries, and in almost all countries, girls would have been capable of college-level science and math classes if they had enrolled in them.

But when it comes to their relative strengths, in almost all the countries—all except Romania and Lebanon—boys’ best subject was science, and girls’ was reading. (That is, even if an average girl was as good as an average boy at science, she was still likely to be even better at reading.) Across all countries, 24 percent of girls had science as their best subject, 25 percent of girls’ strength was math, and 51 percent excelled in reading. For boys, the percentages were 38 for science, 42 for math, and 20 for reading. And the more gender-equal the country, as measured by the World Economic Forum’s Global Gender Gap Index, the larger this gap between boys and girls in having science as their best subject. (The most gender-equal countries are the typical snowy utopias you hear about, like Sweden, Finland, and Iceland. Turkey and the United Arab Emirates rank among the least equal, according to the Global Gender Gap Index.)

The gap in reading “is related at least in part to girls’ advantages in basic language abilities and a generally greater interest in reading; they read more and thus practice more,” Geary told me.

What’s more, the countries that minted the most female college graduates in fields like science, engineering, or math were also some of the least gender-equal countries. They posit that this is because the countries that empower women also empower them, indirectly, to pick whatever career they’d enjoy most and be best at.

“Countries with the highest gender equality tend to be welfare states,” they write, “with a high level of social security.” Meanwhile, less gender-equal countries tend to also have less social support for people who, for example, find themselves unemployed. Thus, the authors suggest, girls in those countries might be more inclined to choose STEM professions, since they offer a more certain financial future than, say, painting or writing.

When the study authors looked at the “overall life satisfaction” rating of each country—a measure of economic opportunity and hardship—they found that gender-equal countries had more life satisfaction. The life-satisfaction ranking explained 35 percent of the variation between gender equality and women’s participation in STEM. That correlation echoes past research showing that the genders are actually more segregated by field of study in more economically developed places.

The upshot of this research is neither especially feminist nor especially sad: It’s not that gender equality discourages girls from pursuing science. It’s that it allows them not to if they’re not interested.