William Gurstelle (born March 29, 1956) is an American nonfiction author, magazine writer, and inventor. He is a feature columnist for "Make" magazine and a columnist and contributing editor at "Popular Science" magazine. Previously, he was the Pyrotechnics and Ballistics Editor at "Popular Mechanics" magazine. Using only the above description and what you know about the world, "William Gurstelle was born in the last 10 years." is definitely correct, incorrect, or inconclusive? 