BP has become embroiled in an acrimonious slanging match with one of the US Gulf states most affected by pollution from the Deepwater Horizon blowout in 2010 with the two sides trading blows over the oil company's cleanup record.
BP has agreed to pay the largest criminal fine in US history – $4.
The teacher's command of his class is total. "Which one is the whole number?" he asks crisply. "Is it seven over three, or is it four?"
The drowned town of Braithwaite slowly emerged from flood waters on Friday, revealing two bodies and ruined homes as a weakened storm Isaac moved further inland, drenching Arkansas and Missouri.
Heavy rain, high winds and floodwaters swept over Louisiana and Mississippi on Wednesday, as Isaac was downgraded from a hurricane to a tropical storm and a fortified levee system appeared to have saved New Orleans from disaster.
Tropical Storm Isaac continued on a path towards the US Gulf Coast on Monday, prompting fears that a strengthened hurricane could hit New Orleans on the seventh anniversary of Katrina.
Millions of residents in four vulnerable Gulf Coast states were bracing for the arrival of a powerful tropical storm that has already claimed several lives on its path through the Caribbean.
The supreme court's decision to give Obamacare the nod triggered a predictably furious reaction from Republican governors. For some it also set off a feeling of deja vu, like an American madeline at a far from Proustian Tea Party.