The United States routinely spends more tax dollars per high-school athlete than per high-school math student—unlike most countries worldwide. And we wonder why we lag in international education rankings? Every year, thousands of teenagers move to the United States from all over the world, for all kinds of reasons. They observe everything in their new country with fresh eyes, including basic features of American life that most of us never stop to consider.One element of our education system consistently surprises them: “Sports are a big deal here,” says Jenny, who moved to America from South Korea with her family in 2011. Shawnee High, her public school in southern New Jersey, fields teams in 18 sports over the course of the school year, including golf and bowling. Its campus has lush grass fields, six tennis courts, and an athletic Hall of Fame. “They have days when teams dress up in Hawaiian clothes or pajamas just because—‘We’re the soccer team!,’ ” Jenny says. (To protect the privacy of Jenny and other students in this story, only their first names are used.)By contrast, in South Korea, whose 15-year-olds rank fourth in the world (behind Shanghai, Singapore, and Hong Kong) on a test of critical thinking in math, Jenny’s classmates played pickup soccer on a dirt field at lunchtime. They brought badminton rackets from home and pretended there was a net. If they made it into the newspaper, it was usually for their academic accomplishments.Sports are embedded in American schools in a way they are not almost anywhere else. Yet this difference hardly ever comes up in domestic debates about America’s international mediocrity in education. (The U.S. ranks 31st on the same international math test.) The challenges we do talk about are real ones, from undertrained teachers to entrenched poverty. But what to make of this other glaring reality, and the signal it sends to children, parents, and teachers about the very purpose of school?When I surveyed about 200 former exchange students last year, in cooperation with an international exchange organization called AFS, nine out of 10 foreign students who had lived in the U.S. said that kids here cared more about sports than their peers back home did. A majority of Americans who’d studied abroad agreed.Even in eighth grade, American kids spend more than twice the time Korean kids spend playing sports, according to a 2010 study published in the Journal of Advanced Academics. In countries with more-holistic, less hard-driving education systems than Korea’s, like Finland and Germany, many kids play club sports in their local towns—outside of school. Most schools do not staff, manage, transport, insure, or glorify sports teams, because, well, why would they?