General fact: 50 is the approximate number of times a mother hen turns her egg in a day so the yolk does not stick to the shell.
Mathematical fact: 50 is the smallest number that can be written as the sum of of 2 squares in 2 ways.
Trivia: 50 is the height in kilometres that a volcano can shoot ash into the sky.
Historical date: February 19th is the day in 1859 that Daniel E. Sickles, a New York Congressman, is acquitted of murder on grounds of temporary insanity.