The world’s richest man and his wife write an open letter every year in which they ponder the opportunities for the Bill and Melinda Gates Foundation, the world’s largest philanthropic foundation. Last year, they wrote about inequity.

This year, inspired by a question from high school students—“What superpower do you wish you had?”—they wrote separate letters to students, with rather charming annotations in the letters’ margins. Melinda answered, “More time!” and wrote about recognizing, redistributing, and reducing the unpaid work that women do, especially in the poor world.