premise: 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.
hypothesis: William Gurstelle is less than 10 years old.
reason: It's definitely incorrect because he was born in 1956. It's difficult because the system has trouble calculating and comparing ages to the current year.