On the night of October 31st, some people around the world, mainly in United States and Canada, celebrate Halloween. Children wear costumes and go to peoples' homes saying "Trick or treat!" (understood here as "Give me a treat or I will play a trick on you"). This, is what you may know ! But did you know that originally Halloween was an English and Christian celebration ? That it was simply All Hallows' Eve, also called All Saints' Day or "La veillée de la Toussaint" in French ? Nowadays and...