【How-to】When was the yoyo invented

Ma’s father, Hiao-Tsiun Ma, a violinist and a professor at Nanjing University, had left China for Paris in 1936. His mother, Marina, a singer from Hong Kong and former student of Hiao-Tsiun’s, emigrated to Paris in 1949, where she and Hiao-Tsiun were married. In 1955, Yo-Yo was born.