Atlantis all set to return to Earth

The countdown has begun for the arrival of space shuttle Atlantis, which is bringing back station flight engineer Sunita Williams back to Earth, whose more than six months in space set a record for the longest single space flight by a woman. Atlantis is scheduled to land in Florida on Thursday. The seven astronauts on board have finished a final inspection of the space shuttle to make sure its heat shield is ready to re-enter earth's atmosphere.