Fait mathématique: 1868 is the smallest number that can not be formed using the digit 1 at most 20 times, together with the symbols +, × and ^.
Culture générale: 1868 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Date historique: February 10th is the day in 1920 that Jozef Haller de Hallenburg performs symbolic wedding of Poland to the sea, celebrating restitution of Polish access to open sea.