Sig Scientists News Today

Unlucky. lets hope so. people have been asking about you. you have been covering the story since the beginning. where is the oil gone? where did it go? >> reporter: there are sig scientists from the government who examined that. they said much of the oil has been recovered. ships and boom have been bringing in a great deal of it. 20% of the oil spilled remains in the gulf of mexico. some in the form of tar balls, sheens, some expected to dissipate by wave action, the suns rays. and salt water is...