April Fools?

Today is April 1, also known as April Fools' Day.  It's a tradition to play tricks on people and then annoyingly laugh, "April Fools!"  I have heard this a few times from my kids and I have to say I'm not a fan.

So, why am I put through this torture every year?  The short answer is we don't know!  The idea of an April fool has been around for over 400 years, and there's no definite explanation.