Rainbow Density Cylinder - This liquid density demonstration will impress and educate children who think of liquids as "all the same." Let young kids play with jars of colored water first, seeing them mix... then show them this. They'll surely be impressed!
The Rainbow Fish, by Marcus Pfister, is about a little fish who learns a lesson about sharing. The best thing about this book is the really neat shiny foil scales that glitter wonderfully during bedtime story!