"Santa has had to adapt over the years to having less and less time to deliver his toys," states the Web site, which is run by the North American Aerospace Defense Command (NORAD). With a world population of more than 6.5 billion, Santa has but a fraction of a second to deliver a gift to each person on Earth. "The fact that Santa Claus is more than 15 centuries old and does not appear to age is our biggest clue that he does not work within time, as we know it."