Great instructional book and human body model.  It is smaller than I thought.  Other reviews warn that the parts of the body will get scattered about the house if you let young child play unsupervised.  Well, my science savvy 4 year old grandson and 6 year old granddaughter started out exploring the parts and were able to put the body back together themselves.  However, after a while, they created some other games and now, about half the parts are unaccounted for--I think their dog ate some.  So parents, this is great for older children, it is a great tool to learn about the body, and great for younger ones with supervision.  Has anyone seen a spleen?