This sounds like so much fun! Walmart has the Great Explorations Sink or Float Super Kit on sale for only $5.00! (Reg. $15) Kids conduct over 20 experiments to discover why heavy things can float and light things can sink. Use levity and explore density, displacement, and buoyancy to discover why some heavy objects float while some objects sink! Includes a complete instruction guide with additional experiment ideas, charts to track predictions and outcomes, and thoughtful questions to ponder and investigate.