Gravi-Goo is a superabsorbent polymer that transforms into a slippery, slimy substance that seems to defy gravity!  Just add water to Gravi-Goo and watch as this liquid seems to pour itself up and out of the cup! Learn about the science behind this amazing slime and also some fun activities to complete with it.  Makes 4 gallons of amazing goo.  Recommended for children 10 and up.