Leatherback turtles roamed the world's oceans when dinosaurs ruled the land.  But some parts of their lives are still mysteries to the scientists who study them.  One thing about them is not a mystery and that is the fact that they are endangered by man and nature.  Will this largest of sea turtles be able to survive when their nesting beaches are shrinking and their feeding grounds are being polluted?  Find out how you can help.