National Public Radio: Crews in the Gulf of Mexico are reevaluating plans to use a 100-ton steel-and-concrete dome to contain oil gushing from a blown-out well on the seafloor after gas hydrates — a slushy mix of water crystals and gas — plugged a hole in the top of the experimental device. The buildup made the white dome too buoyant and clogged it up, BP chief operating officer Doug Suttles said. Workers who had carefully lowered the massive box over the leak nearly a mile below the surface had to lift …