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I ordered 3 of these books based on reviews and received the first one and so far it's a success with my 3.5 yo. She was quite interested with most of it but kept turning back to the skeleton as it's "scary". I have an x-ray of her scull, face, and top of her spine which she's now fascinated with, calling it her "scary face", complete with a "roar". After being very afraid of having an x-ray she was asking to get another one, so I hope we can look forward to a lot more cooperation next time. This book could be very helpful for explaining beforehand to young children who are having operations or an x-ray.