Agence France-Presse: A brain trust of scientists has been assembled by President Barack Obama’s administration to help BP cap the well that has been gushing oil into the Gulf of Mexico for nearly three weeks. Secretary of Energy Steven Chu, a Nobel prize-winning physicist, told reporters Wednesday that the “intellectual horsepower of the country is engaged in solving this problem.” Chu said he had called upon the “very best” physicists, engineers, materials scientists and geologists from the …