How to yo-yo without a string attached... So many crazy tricks and the science that makes it possible.
posted by Mordhaus
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How to yo-yo without a string attached... So many crazy tricks and the science that makes it possible.
posted by MordhausWhy does a bike stay up -- even with no rider?
posted by messengerDerek Muller from Veritasium lifts a gyroscopic fly wheel above his head.
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