april fool's day????

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It's april fool's day...I get that we are supposed to trick people or play a joke in the spirit of the day. My question is why?? Where did this custom originate?? What is the meaning of this day?? When did all this start?? Just out of curiousity does anyone out there know the answers to 1 or all of these queries? I don't that is why I'm asking. I have never wondered on this until now....Mamablaze!!