Reuters: U.S. scientists will embark on a second mission on Tuesday to investigate whether a catastrophic Gulf of Mexico oil spill is damaging deepwater marine life and the surrounding environment. Samantha Joye, a University of Georgia marine sciences professor who is part of the research team, said the two-week government-funded mission will focus on a plume of dispersed oil that she says is from the leaking BP undersea well. The plume, which is roughly 20 miles long, six miles wide, …