Hecho general: 50 is the traditional number of years in a jubilee period.
Hecho matemático: 50 is the smallest number that can be written as the sum of of 2 squares in 2 ways.
Trivia: 50 is the speed limit, in kilometers per hour, of Australian roads with unspecified limits.
Fecha histórica: February 19th is the day in 1649 that the Second Battle of Guararapes takes place, effectively ending Dutch colonization efforts in Brazil.