From magic snow to plant pals, this category features toys that expand and grow.
3 animals that grow in water!
Explore the fun side of science with this super combo pack!
Add water to see these foam pets hatch and grow!
Glass-enclosed liquid and air, small changes in heat causes air pressure to move liquid.
Add water and the snake grows to 4 feet!
13 lab activities using the Warblette polymers.