followed by the spell "Lumos." This will turn on the flashlight, much like how the spell illuminates the movie scenes. To turn it off, invoke Siri and say "Nox." Another "Harry Potter" spell you ...

J.K. Rowling's wizarding world in the "Harry ... Lumos comes from the Latin word "lumen," meaning "light." Rowling also named her charity for orphaned children after the same word. "Nox ...