"A dusty book that can offer valuable knowledge and stress relief for adults."
Books can be found from expeditions in the wasteland and are stored in bookshelves. While adults can use them to relieve stress, books are unable to be used by children as they said it's boring.
A bookshelf even with only one book can still be reread many times. Unlike training boxing, you can read about 4 books since fully awakened until feeling tired. However, as each book values 15 in trading, there are upperhands to keep several books as side items on expenditure or at storage for trading purpose when other resources are depleting.