MSN Encarta suggests that this was not the most, um, momentous day in history. Except, that is, for a crack surgical team at Davenport General in 1885:

January 4, 1885: The first successful appendectomy is performed in Davenport, Iowa.

Of course they had already been doing appendectomies for years in Moline, Rock Island, and Bettendorf. Davenport always was late to the party.