You may think you know everything there is to know about yo-yos, and there’s a good chance you know the basics, but there’s an even better chance there is a bigger, more fascinating world of the yo-yo ...

Forget about little kids walking the dog. The 21st-century yo-yo scene features the grim-faced concentration of young men in hoodies and skullcaps slinging yo-yos behind their backs and weaving ...