Elizabeth II, at the age of 91, is the longest-reigning monarch ever to sit on the throne of England. Most people living today have no memory of a time when she was not Queen. But when she was born, no one knew she was destined to rule. Her father, the Duke of York, was only the second son of George V. His dashing playboy brother was Prince of Wales and heir to the throne. It wasn't until King Edward VIII abdicated his throne to marry Wallis Simpson...