Learn about buoyancy with this fun cartesian diver toy.

Fill a recycled plastic bottle with water, add the assorted "deep sea trash" and drop your seahorse in the bottle as well.  Squeeze the bottle to increase the pressure and watch your seahorse dive to hook the deep sea trash. Release the bottle and the seahorse floats back to the top. This set includes a learning booklet that teaches all about pressure and density while your child is just having fun. You can dive over and over again!

• No tools, glue or batteries required
• Set includes 8 pieces and a learning booklet