Who is Dave King from On Writing: A Memoir of the Craft and what is their importance?

Dave King is Stephen King's older brother. Dave was an intelligent young man who was often getting himself and Stephen King into trouble. Stephen King can remember once when his brother was working on a science experiment for school. Dave was attempting to make a magnet that he read about in a book. However, Dave wanted to make a bigger, better magnet. Dave wrapped the wires from a power cord over a nail and told Stephen King to plug it in. Stephen King did, and the transformer outside their apartment building blew, causing a power outage all over the block.