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Here's a perfect experiment for a cold, wintry day! The promise of warmth and coziness is fantastic motivation for your child to experiment with this practical application of chemistry—keeping his hands warm. The loaded combination of a few natural materials results in a natural warming device that will astonish your child! This homemade hand warmer will work its magic for up to six hours, although the iron will continue to rust for an entire day. The best part: it's biodegradable and non-toxic.