Attending all-boys schools or all-girls schools, rather than attending coeducational schools, is significantly associated with higher average scores on Korean and English test scores. A chance meeting between Arnold and Reue, who studies fat tissue, made the two scientists wonder whether the sex chromosomes might also affect metabolism. Content copyright © Journal Media Ltd. Putting this research into practice, however, has triggered a debate that extends beyond pure academics. He decided to make the switch to single-sex classrooms in hopes of decreasing the discipline problem. Researchers noticed, for example, that male and female wallaby embryos began to develop genitalia before their gonads started to make hormones. Some research into gender differences in learning even looks at how girls and boys respond differently to changes in temperature, suggesting that girls prefer warmer rooms while boys prefer to learn in cooler conditions. Once the sex of the gonads was set, it seemed that the sex chromosomes' job was done.
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