Think about the things 11-year-olds typically do - ride bikes, skip rope, play catch and maybe join a pick-up game of basketball. Charles Mullins is a little different. He started to skydive when he was 11. Now 15, the teen-ager from Germantown, Tenn., still holds the record as the world's youngest sky diver. In his own words, "It's an honor." Charles was not nervous on his first jump. The on