Date of publication: 2020-10-31 15:10
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![THIS IS BTS | Introduction to BTS [Part 1] from YouTube · Duration: 15 minutes 38 seconds](https://i.ytimg.com/vi/-CmadmM5cOk/hqdefault.jpg "THIS IS BTS | Introduction to BTS [Part 1] from YouTube · Duration: 15 minutes 38 seconds")
That's Why Escalator Stairs Have Grooves from YouTube · Duration: 8 minutes 3 seconds
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Bill Nye The Science Guy-Bones & Muscles from YouTube · Duration: 22 minutes 2 seconds
