Swell Polymer Rainbow Spheres- Science of Polymers Color:Clear you can run

you can run

INCLUDES: 5 pieces of medical equipment - including a stethoscope blood pressure monitor thermometer syringe reflex hammer and handy red soft cotton case

5" diameter

and toys for children and families that facilitate creative play and imaginative thinking

Supervision is recommended at all times

Swell Polymer Rainbow Spheres- Science of Polymers Color:Clear you can runThese curious growing spheres are made from a chemical known as a super absorbent polymer (or SAP). SAPs are amazing materials. They are long chains of molecules that join together in a net like pattern. Water is pulled in through the holes of the net. then the molecule chains soak up tremendous amounts of water. When the molecules absorb water, they swell and soften and transform into a hydrogel water bead. Swell! All in a packed in a test tube and