LiveScience: Recurrent sheens of oil in the Gulf of Mexico near the site of 2010's Deepwater Horizon oil spill have baffled researchers and led to fears that oil may once again be spewing from the seafloor well. But a study published this week in the journal Environmental Science and Technology shows that there is no new leak: The oil is coming from isolated tanks and pockets within the wreckage of the sunken rig, according to a statement from the National Science Foundation (NSF), which funded the research....