It has long been true that women are paid less than men at work and do more of the labor at home. It turns out those patterns start as early as childhood.

Although there are a few signs that the gap is shrinking, a variety of data shows that girls still spend more time on household chores than boys do. They are also paid less than boys for doing chores and have smaller allowances.

One recent analysis, for example, found that boys ages 15-19 do about half an hour of housework a day, and girls about 45 minutes; and that while girls spend a little less time on chores than they did a decade ago, the time that boys spend has not significantly changed.