ever since elementary school. Sometimes I wish I could access the baseball files in my head and download them into a text file. It'd take up many gigabytes. 
Btw -- pretty much everything you could want to know about baseball, statistics-wise, can be found at baseball-reference.com. It goes back to 1876 (though records that old are sketchy), when the National League was formed, and includes the Negro Leagues, Mexican leagues, minor leagues and others. I mean, you can probably find Candy Cummings' (inventor of the curve ball) WHIP.
(What you won't find there is anecdotal stuff, like Roger Bresnahan invented shin guards or Cap Anson was a huge racist. For that, y'gotta read like ten thousand books... and I'm probably pretty close to that.) 
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