Each year we celebrate a holiday at the end of October that involves costumes, candy and pranks. Can you guess which holiday I'm talking about? Of course you can! Halloween is one of the most important holidays of the year, second only (in my opinion) to Christmas. We follow many strange traditions on Halloween, but why? Why do we dress up? Why do we get candy? And what is the meaning of the phrase “Trick or treat”? To explain it we have to go back to the beginning of this disturbing holiday. Long ago, a people known as the Celts celebrated a holiday called Samhain. The Celts lived two thousand years ago in what is now Ireland, the United Kingdom and northern France. The Celts began each new year on November 1st; This is the day that concludes the harvest and marks the beginning of the cold and harsh winter, which many then feared had not stored enough food to survive. With all this in mind, it's no wonder that this time of year was often associated with death. So the day before, Samhain, the Celts believed that the boundaries of this world and the Dead World were blurred and that...