S1E150 - Kapow's Power of Invention: The Toothbrush
Lucy Wow: STEM Stories for Kids Who Love Inventing - Podcast tekijän mukaan GoKidGo: Great Stories for Kids - Tiistaisin
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All throughout history a variety of mouth cleaners had been used. Archaeologists have found evidence of tree twigs, bird feathers, animal bones and porcupine quills used by ancient people to protect their smile. Tune in today to find out how we went from porcupine quills to toothbrushes!