Glow in the Dark SQUIDY Cartesian Diver;

Everything is cooler when it's glow-in-the-dark!    Now the popular soda bottle science toy is available in glow-in-the-dark. SQUIDY is our most popular Cartesian diver of all time. Everything is cooler when it's glow-in-the-dark! Now the popular soda bottle science toy is available in glow-in-the-dark green. SQUIDY has become a classic science toy! Squeeze the plastic soda bottle and SQUIDY swims up and down in the bottle of water. Children can't help but ask, "How does that work?" The illustrated instructions show how to construct the Cartesian diver and explain the scientific principle behind its action. Recommended for children ages 6 and up. Glow-in-the-Dark SQUIDY with Bottle