A seemingly intrinsic part of the game of baseball is the keeping of statistics on the achievements of the players. Started by Henry Chadwick in the 19th century who devised the concept of batting average based on his experience of cricket. Commonly used statistics are explained here:
... money. They sell books and videos, often with ridiculous ideas about nutrition.
A more disturbing, and a practice more often acknowledged to be quackery, are the miracle ...