The yo-yo became popular in the United States after it was marketed by Donald F. Duncan Sr., a businessman from Chicago, but he didn't invent the toy.
In 1928, (the year before BBB was born

) Duncan was on a business trip to San Francisco when he say Philippine immigrant Pedro Flores, who had gotten financing to manufacture the yo-yos and had trademarked the name, demonstrating how to use the toy. Duncan realized that the toy had the potential to be a huge success so he paid Flores $5,000 for all the rights.
Incidentally, the name "yo-yo" means "come-come" in the native language of the Philippines.
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