I was very moved by an article in Parenting Notes. The title of this article is "Pieces of Paper by the Bookshelf", which tells that the teacher put many new books on the bookshelf in the classroom, but always found that some books were destroyed. So, the teacher used the morning conversation to educate the children about books. However, after a few days, this phenomenon still appeared. The teacher found out the reason. It turned out that the children were playing with origami planes, so the teacher prepared some homework papers for the children to make it easier for them to make origami planes. But after a few days, the cover of the book was torn a lot, and the teacher found out the reason again.