How NASA technology can help save whale sharks -- the world's largest fish

Thousands of people around the world are lending a hand to help save the world's biggest fish. By taking photos of whale sharks, these "citizen scientists" are providing researchers with critical information about the giant sharks' population hotspots and migration routes.

Whale sharks are endangered, with estimates suggesting populations worldwide have plummeted by more than 50% over the past 75 years. Although they are protected in many countries, whale sharks are still killed by the fishing industry -- caught deliberately for their fins (shark fin soup is a delicacy in parts of Asia) and as accidental bycatch, especially in tuna fishing areas where whale sharks and tuna swim close together. Whale sharks are also //////////////