These child inventors changed the world! Welcome to WatchMojo, and today we’re counting down our picks for the most useful things invented by kids. Our countdown of the greatest things you didn't know were invented by kids includes Crayon Holders, Makin' Bacon, Water Talkie, and more! Which of these under-20 inventors impressed you the most? Let us know in the comments.

Watch more great invention videos here:
Top 10 Inventions of All Time: https://youtu.be/bNUfZ3_VkuE
Top 10 Inventions with Disturbing Backstories: https://youtu.be/9PtOZz19mQ0
Top 10 Discoveries That Changed Everything: https://youtu.be/yPKkPTUTMQQ
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