April Fools or April Fish?

Wonder about the origins of the calendar's silliest holiday? What the heck was a "Poisson d’Avril?" Novopress.info has the story on its website.

Evidence seems to point to 16th century France, when the change to the Gregorian calendar forced citizens to give up their pagan revels on April 1. Those refusing became the subjects of pranks and became known as Poisson d’Avril or "April Fish."