1969 ARMSTRONG WALKS ON MOON: At 10:56 p.m. EDT, American astronaut Neil Armstrong, 240,000 miles from Earth, speaks these words to more than a billion people listening at home: "That's one small step for man, one giant leap for mankind." A moment later, he stepped off the lunar landing module Eagle and became the first human to walk on the surface of the moon. The American effort to send astronauts to the moon has its origins in a famous appeal President John F. Kennedy made to a special joint session of Congress on May 25, 1961: "I believe this nation...