Grow a fantastically detailed brain that expands when placed in water.
Live out a mad scientist’s dream by growing an amazingly large brain. Drop this 2" polymer brain into a large bowl, fill with water, and watch it grow into a full sized, 6.5" adult human brain in just a matter of a few weeks. Change the water every few days until it reaches its max potential. Caution - brain may keep growing and take over the world!