The one star reviews claiming crude scenes and vulgarity being depicted in these books are 100% FALSE. My kids love these books and we use them as part of our curriculum. The Tuttle Twins take topics (that a lot of adults don’t even have a great grasp on these days) and make them easy to understand in a fully kid appropriate manner. The principles taught in the Tuttle Twins books are so necessary this day in age. Parents- take control of what your kids are learning. TEACH THEM what the freedom of being an American truly means. These books will help you with that task, I promise.