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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. ???? When Julian thinks of lasers, he thinks of space heroes who engage in wild battles in space with laser cannons and laser swords. In this video, Julian learns how lasers are created, what they are intended for and how they are used. * Comments are disabled to protect minors. If you have any questions or comments, please email [email protected].