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Parents need to know that while most episodes of this series don't contain sex or violence, some cover topics like human reproduction, gun ballistics, mummification, and Roman war technology. For younger or more sensitive children, some of the related imagery might be more disturbing than demystifying. Similarly, episodes about things like the end of the sun, extinctions, and volcanic devastation have images that some kids might interpret as "violence." Many episodes examine phenomena that some people consider less than credible; the show presents perspectives from some scientists that might surprise viewers.
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