Does the human body contain gold? Can eating spinach really make you stronger? Quench your curiosity with the fascinating facts behind every-day mysteries. Why are the school busses yellow? Why do you get a headache drom cold drinks? How do volcanoes erupt? Is it true that if an earthworm is cut in two, it will become two earthworms? Nails don't all grow at the same rate! Hot water freezes faster than cold water! Frogs use their eyes to swallow food! People are allergic to cat hair. False! Why are some clouds white, while others are grey or black? How do cicadas sing? How do fireflies light up? How do fish breath underwater?