BEFORE READING The Yo-Yo is a simple toy originated in the Philippines. Since 1930 it has become a popular toy and even today 02001 HowstutfWorks children in different countries play the Yo-Yo and compete in various contests. 安徽得技学院 Anhui Science and Technology UniversityBEFORE READING The Yo-Yo is a simple toy originated in the Philippines. Since 1930 it has become a popular toy and even today children in different countries play the Yo-Yo and compete in various contests