Oklahoma town reduced to rubble by tornado
Philippe Cousteau works with the Catlin Seaview Survey team to see how our actions have affected the Great Barrier Reef.
Hawaii's shark experts are close to revealing startling new secrets about the ocean predators and now, they have the video to back it up.
President Barack Obama will travel to tornado-ravaged Oklahoma on Sunday, the White House announced. At least 24 were killed in the mammoth twister.