CAPE CANAVERAL, Fla. (AP) - NASA is about to embark on its hottest mission ever, to Mercury. The Messenger spacecraft, to be launched next week, will be blasted by up to 700-degree heat as it orbits the tiny planet closest to the sun - so close that it would be as though 11 suns were beating down on Earth. Remarkably, the only thing between the probe's room-temperature science instruments and the blistering sun and pizza-oven heat will be a handmade ceramic-cloth quilt just one-quarter of an inch thick. "If it doesn't stay toward the sun, it will fry everything," said...