Fait mathématique: 1848 is the smallest value of n for which _{2n}C_{n} is divisible by n^{2}.
Culture générale: 1848 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: January 21st is the day in 1971 that the current Emley Moor transmitting station, the tallest free-standing structure in the United Kingdom, begins transmitting UHF broadcasts.