This is the coolest.  My 9 year old daughter is so intrigued by it, she loves the feel of the sticky, squishy parts, and the book that came with it is priceless.  Great for homeschoolers.  Also, works both for science and health class.  To further "health class", we will look into the affects of smoking on the lungs and body, and she will be able to see what the lungs look like and where they are located.  She absolutely loves this product, and if she loves it, so do I, because I strive to find things that make learning fun and enjoyable for her.