" Stringless " and " Yo - Yo " are two words you don't expect to see together because a Yo - Yo without a string is just a giant plastic spool ca... ...t a giant p...
https://www.neatorama.com/2016/07/15/The-Science-Behind-The-Stringless-Yo-Yo/
The Science Behind The "Stringless" Yo-Yo
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