Fatto matematico: 4443 is a number n for which n^{2}+1 is 10 times another square.
Trivia: 4443 is a number for which we're missing a fact (submit one to numbersapi at google mail!).
Data storica: February 29th is the day in 1988 that South African archbishop Desmond Tutu is arrested along with 100 clergymen during a five-day anti-apartheid demonstration in Cape Town.