Calm Waters, Port Orange, Florida

AP - Despite their tiny size, plant plankton found in the world's oceans are crucial to much of life on Earth. They are the foundation of the bountiful marine food web, produce half the world's oxygen and suck up harmful carbon dioxide.

LiveScience.com - In June, a clam boat happened upon some old military munitions off the coast of Long Island, New York. Mustard gas, released when the fishermen inadvertently hauled in the shells, blistered one crew member and reminded government officials, scientists and the public of the weapons arsenal that is buried deep below the surface of the world's oceans.