Sometimes I read the same books over and over and over. What's great about books is that the stuff inside doesn't change. People say you can't judge a book by its cover but that's not true because it says right on the cover what's inside. And no matter how many times you read that book the words and pictures don't change. You can open and close books a million times and they stay the same. They look the same. They say the same words. The charts and pictures are the same colors. Books are not like people. Books are safe.