books.google.com - What time is it at the North Pole? What's the chemical formula for a human being? Why do boomerangs come back? Why do flying fish fly? Do the living really outnumber the dead? Why does lightning fork? Why does the end of a whip crack? Everyone has at one time...http://books.google.com/books/about/Why_Don_t_Penguins_Feet_Freeze.html?id=Egp3tWYDTxoC&q=bubbles&utm_source=gb-gplus-shareWhy Don't Penguins' Feet Freeze?