How many times do you need to fold the piece of paper so that you can reach the moon.

需要折纸多少次,才能碰到月亮。

哈佛公开课 - 幸福课课程节选

So if you can have a piece of paper here, and you fold it 41 times by the end of the class, you can reach the moon.

如果你们有一张纸，再在下课之前折叠41次，你就能碰到月亮。

哈佛公开课 - 幸福课课程节选