well in theory this toy is great fun for children. however you NEED TO BUY ALOT of the materials needed. and when we opened our box the glycerol was missing, took product back, and the store opened all their boxes on shelf, to fins the same item missing. when i rang the products customer service number on bottom of pack i got the following response: i am so sorry to hear thet, we have never had this problem before, goto "website" and BUY it from here..... i was disgusted!!!!! my daughter bought this out of her birthday money, and they couldn't even send a good will gesture? on a whole, i suggest avoid this product, as all the experimants can be found online. YOUR BUYING THE BOOK, NOT the experiments!