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Already checked? You can find even more exciting videos in the Checker World of the ARD media library: https://1.ard.de/checkerwelt. ???? Checker Julian tests crazy and important inventions and wants to become an inventor himself with his mattress backpack idea. ???? What inventions do we need for the future? Checker Tobi tells us in his CheckPod in the ARD audio library: https://www.ardaudiothek.de/episode/c...