A mysterious green cantaloupe-sized metal ball with an unknown firing device, found in 2005 by GIs and a freelance journalist in Mosul, Iraq, is confounding weapons experts trying to pinpoint its origin. Dubbed "Mystery Weapon 2" by Iraq-based journalist Michael Yon, the orb was found under a barn among a weapons stockpile that was later destroyed by the 1st Battalion, 24th Infantry Regiment. "If there's anything that, honest to God, could have nefarious overtones, it's that, because nobody was able to tell what it was," Yon said.