Walk the dog. Around the world. Rock the baby. Nearly everyone recognizes these phrases as the repertory of the yo-yo enthusiast. Now, 62 years after Donald F. Duncan Sr. brought it back from the P… ...

Gus Somera, 82, one of the original demonstrators for the Duncan YoYo Co., helped introduce the toy in the United States and abroad. Mr. Somera, whose non-professional name was Sotero Parpana, was … ...