It has become an iconic anti-war symbol and one of the most powerful anti-war paintings in history. It shows the results of the casual practice bombing by Hitler's German air force, acting in support of General Francisco Franco during the Spanish Civil War, of the little village of Guernica, Spain on April 26, 1937.
Quick Answer. The normal maximum mouth opening (MMO) is approximately 48 millimeters for humans. The ability to position three fingers of either the left or the right hand in the mouth between the upper and the lower front teeth indicates normal size of the mouth. Continue Reading.
Most species of sharks have five pairs of gill slits on each side of their head, but a few have six or seven pairs. The gills are crucial to a sharks breathing system. By opening its mouth, water is drawn into the shark. The open mouth gives the appearance of a smile in many sharks. When a shark closes its mouth, the water is forced over its gills and the tiny blood vessels in shark gills absorb oxygen from the water. To aid water flowing over its gills most sharks swim forward all the time, called ram ventilation, and is characteristic of more active open ocean sharks.