Set off a chemical reaction with Horrible Science Chemical Chaos . This explosive science kit contains everything you need to perform ten horribly chaotic experiments ! Grow your own stalagmites and stalactites, and crystals that rock. Discover why wet nappies stay dry and why yeast is yucky, make your own gas and perform the acid test ! There is also a 36-page top secret lab notebook . Horrible Science Chemical Chaos is a great way to encourage an keen interest in science.