"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 cast in flashy colors.
But Yo-Yo wizard Ben Conde can do some amazing aerial tricks with his "stringless" Yo-Yo, proving the string doesn't need to be attached for a Yo-Yo to function in spectacular fashion.
This enlightening video by Veritasium reveals the secret behind the incredible tricks you can do with a stringless Yo-Yo- friction!
-Via Nerdist