• When you pull that balloon back, you're hiding energy inside the rubber. Stretched molecules desperately want to snap back — all that wanting is stored up as elastic potential energy. You can actually feel it building in your fingers.

• The moment you let go, that stored energy has nowhere to go but into the pom pom — and it converts instantly into kinetic energy, the energy of movement. One type of energy becomes another, right in your hands.

Did you notice pulling back further sent the brain flying further? More stretch means more stored energy means more speed. The balloon is an energy storage tank — and you control how full it gets.

Did you also notice that heavier brains don't fly as far? Same energy, more mass — less speed. That's Newton's Second Law doing its thing.

Your monster just demonstrated some of the most important rules in physics — with a toilet roll and a balloon.

But here's the question — if you pull back twice as far, does the brain fly twice as far? 

The answer will surprise you. Find out in The Crazy Scientist Lab!