Fait général: 1728 is braces were first invented by Pierre Fauchard.
Fait mathématique: 1728 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Culture générale: 1728 is braces were first invented by Pierre Fauchard.
Date historique: September 23rd is the day in 1641 that the Merchant Royal, carrying a treasure worth over a billion US dollars, is lost at sea off Land's End.