New research suggests that Neil Armstrong's first line on the moon did not include the world "a". Listening to Armstrong uttered the first sentence by man on the moon you heard, "One small step for man; one giant leap for mankind". On his way back to earth, Armstrong said he thought he had said, "One small step for a man; one giant leap for mankind". Thus emerged a controversy over the missing "a". The two possibilities were obvious but evidence supporting either was scarce. Either the static in the transmission had made the "a" in audible on earths end, or Armstrong did not say the word "a" in the famous line.
In 2006 an analysis suggested that there was room for that "a" in his line. The new analysis suggests just the opposite.
I doubt this will put the dispute to rest.
Video embedded below. (from http://news.bbc.co.uk/2/hi/science/nature/8081817.stm)