A scientist holds a clump of oil and sand, suspected from the oil spill in the Gulf of Mexico, in South Pass, Louisiana May 14, 2010. For over three weeks roughly 5,000 barrels (210,000 gallons/795,000 liters) of oil per day have been gushing from BP's broken Deepwater oil well situated in the Gulf of Mexico, in what could be named the worst oil spill in U.S. history. REUTERS/Lee Celano (UNITED STATES - Tags: DISASTER ENERGY ENVIRONMENT)