Shuttle Endeavour on its mark for flight

NASA gave shuttle Endeavour a green light Wednesday to blast off June 13. Its seven astronauts will climb aboard the spaceship today for a launch-day dress rehearsal.Wearing bright-orange launch-and-entry suits, the astronauts will leave crew quarters at Kennedy Space Center early today, board NASA's sleek silver Astrovan, then make the 12-mile trip to launch pad 39A.A small green elevator will