The Japanese Gyroball Mystery – New York Times
Tezuka came up with the gyroball in 1995, when he was given a toy known as the X-Zylo Ultra. The toy, a flying gyroscope, could travel as far as 600 feet when thrown with a spiral. Tezuka wondered why the motion could not work on a baseball.
Tezuka visited the Rangers’ spring training complex Tuesday, mainly to see Otsuka, but he was approached by several other pitchers. They had the same questions everybody else does. First, they wanted to know if the gyroball is for real.
Then, they wanted to know how to throw it.