这篇文章揭秘了暑假的真正由来，远非“农忙需放假”那么简单。19世纪的教育改革、城市健康考量、教师性别偏见等多重因素，共同塑造了如今的暑假制度。让我们一起穿越历史，探寻暑假的秘密吧！
Pop quiz.
Why do kids have summers off from school?
It's because back in the day, they had to help out on farms, right?
This may be the most cited reason, but it doesn't even make sense.
Most crops are planted in the spring and harvested in the fall.
The real reason for summer break has a lot more to do with these kids than these.
However, ever since summer vacation became an entrenched part of American culture, Parents, researchers, and policymakers have worried about its effects on kids' academic achievement.
But more recent research suggests these concerns are overblown.
It turns out that these fancy rich kids might have had the right idea all along.
Schools today generally operate on a 180-day calendar.
