One routine yard maintenance project turned into a bomb squad call after a homeowner discovered an unexpected item beneath an oak tree. The discovery in Middletown, Ohio, prompted a check from the Butler County Bomb Squad after the man was unsure whether the cannonball he found could explode. The object was 5 inches and 8 pounds, per WKRC, which shared images of the discovery. The homeowner, who asked not to be identified, contacted authorities…