This one is fun - lots of cool experiments. Grabbed it from the library but will check it out again soon, and it'll also prob go on the kiddos wishlist for Christmas. Big range of experiemtns too, some that we'll wait until the kiddos are older, but lots we could do now. Also pretty much all of them used stuff we already had, or could be obained cheaply from the grocery store. Can't beat that.Fun way to get them interested in science.