Dolphins are carnivores (meat eaters). | Stannous fluoride, which is the cavity fighter found in toothpaste is made from recycled tin. | The crack of a whip is actually a tiny sonic boom, since the tip breaks the sound barrier. | Over 50 percent of your body heat is lost through your head and neck. | The Spanish word esposa means "wife." The plural, esposas, means "wives," but also "handcuffs."