Most people know what Neil Armstrong said when he first set foot on the surface of the moon on July 20, 1969.
“One small step for man, one giant leap for mankind.”
According to an article from Houston Chronicle a researcher discovered that “One small step for a man, one giant leap for mankind” is the more dramatic and grammatically correct phrasing that Armstrong, 76, has often said was the version he transmitted to NASA’s Mission Control for broadcast to worldwide television.
Peter Shann Ford is said to have used GoldWave software to discover traces of the spoken “a”, lasting a total of 35 milliseconds, 10 times too quickly to be heard.
BBC News has an article on this as well.