General fact: 42 is the answer to the Ultimate Question of Life, the Universe, and Everything.
Mathematical fact: 42 is the product of the first three terms of Sylvester's sequence; like the first five such numbers it is also a primary pseudoperfect number.
Trivia: 42 is the number of kilometers in a marathon.
Historical date: February 11th is the day in 1826 that University College London is founded under the name University of London.