#11: Shrinky Dinks
For some reason, children love the idea of watching things shrink. It might not seem like much of an activity, but seeing something change size significantly can help children understand more about the world, art, and living organisms.
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While Shrinky Dinks were an excellent tool for this kind of learning, they were notorious for emitting strong plastic fumes. After a while, parents began questioning the potency and safety of these fumes, seeing as they were constantly filling their kitchen.