April Fool's Day

Happy April Fool’s Day
It is that date, the date to be aware of everything, especially when you a) have children and/or b) come from a family of practical jokers. I went looking for the history of April Fool's Day, and why we celebrate it, and I could not find any one source that shows the main reason...
Lisa’s Logic: Some Fun for April Fool’s Day
Friday is April Fool's Day. I found one reason for the day is when they moved the new year in 1564 from the end of March to the beginning of January, the French would stick a fish to the back of those that celebrated the new year March 25 to April 1 and were called "Poisson 'd Avr…