My new friends have begun to suspect I haven't told them the full story of my life."Why did you leave Sierra Leone?""Because there is a war.""You mean, you saw people running around with guns and shooting each other?""Yes, all the time.""Cool."I smile a little."You should tell us about it sometime.""Yes, sometime."This is how wars are fought now: by children, hopped-up on drugs and wielding AK-47s. Children have become soldiers of choice. In the more than fifty conflicts going on worldwide, it i...