April 20, 2015, marks the fifth anniversary of the BP Deepwater Horizon oil spill in the Gulf of Mexico, one of the largest environmental disasters in U.S. history. The story is far from over. If you are covering the legacy of the spill, SEJ is offering two special TipSheets by the Advocate's Amy Wold that will help you get the facts and background. Photo: Oiled endangered Ridley's turtle. Credit: Carolyn Cole/ LA Times; courtesy NOAA.