Amazin’ Avenue has a fascinating piece looking at the “family tree” of R.A. Dickey’s knuckleball. The short version: He learned it from Charlie Hough, who himself learned it from Goldie Holt, then an instructional coach with the Dodgers. But Hough didn’t master the pitch until the Dodgers hired Hoyt Wilhelm to help him perfect it, and Wilhelm based his grip and motion on those of Emil “Dutch” Leonard, who spent twenty seasons in the majors between 1933 and 1953. So that’s the short version. Read the full version here. [Amazin’ Avenue]