After drowning lots of toys in the bathroom sink, seeing what floats and what doesn't (no, Loo Bear, please don't soak all your pencils in the water...), the boys spent the afternoon getting their hands into some Non-Newtonian fluid AKA Oobleck AKA cornstarch in water suspension AKA messy fun in the name of science.*
The more force you apply, the more resistance you meet. Go gentle and slow, stop applying pressure, and the solid turns back into an oozing liquid goo. Hmm, there's a lesson in there somewhere.
*Those with sensory avoidance issues may need lots of encouragement; and a drop of some pleasant essential oil mixed in wouldn't go astray as the mixture is a bit smelly as Shmoo Bear so dramatically pointed out.
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"Everybody is a genius. But, if you judge a fish by its ability to climb a tree, it will spend its whole life believing that it is stupid."