A fact from List of knuckleball pitchers appeared on Wikipedia's Main Page in the Did you know column on 10 July 2010 (check views). The text of the entry was as follows:
Did you know... that at least four different knuckleball pitchers have been credited as the inventor of the knuckleball, first used in the 1907 or 1908 baseball season?
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This list is incomplete and does not include Hal Brown, a knuckleballer who played in the 1950's for the White Sox, Redsox and Orioles among others. Also Bobby Shantz is not listed on the list.