NOTE: Old stock, still works perfectly but no longer on card backing. Grow your own Grey Matter! The fun never ends… You can grow it again and again! Simply place the toy in water and watch it grow over the next few days. To shrink your toy simply remove it from the water and allow it to dry. Perfect for party favors!

Ages 5 and up.
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Growing animals and other things (brains, princes, etc) that are made to increase in size in water are made up of two polymers. One is poly(vinyl acetate) which keeps the original proportions and shape of the item or creature and the other polymer is polyacrylamide, which is the super absorbent polymer. The growing creatures have many teaching applications in science and math, including graphing, drawing conclusions, and measurement using linear, mass and volume.