Grow a Brain - Expand your Mind!


Super absorbent 2" brain expands in water - a mad scientist's dream!

5878 Reviews

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!

Why They'll love it

  • Grows from 2" to 6.5"
  • Fantastically detailed brain
  • Takes a few weeks to reach full size

Technical Stuff

  • Age: 8+
  • Box size: 5" x 2.25" x 2.25"
  • Weight: 1.5 oz.
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