Underwater 'Snowstorms': an Unexpected Consequence of Oil Spills

Exactly five years to the day, an explosion at the Deepwater Horizon oil rig leaked nearly five million barrels of oil into the Gulf of Mexico. Now, research looking into the long-term effects of this disaster have made an unexpected discovery. Oil may encourage the formation of an unusual fall of organic matter called "marine snow" - a revelation that could help find smaller oil leaks in the future.