"Stringless" and "Yo-Yo" are two words you don't e... ...ectacular fashion.(YouTube Link)This enlightening video by Veritasium reveals the secret behind the incre...
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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