SchrodingerZ writes "In an upcoming BBC Documentary, Dean Armstrong, the brother of astronaut Neil Armstrong, reveals when the world famous 'one small step for man, one giant leap for mankind' line originated. For years, people have argued over when Armstrong came up with the line, whether it was on the spot or planned years ahead. Also debated is whether Armstrong meant to include 'a' before man, making the indefinite article 'man,' which alludes to mankind, into a singular, 'a man,' himself. According to Dean Armstrong, the quote was shared to him over a board game, months before the mission began. He says, 'We started playing Risk and then he [Neil] slipped me a piece of paper and said "read that." I did. On that piece of paper there was "That's one small step for man, one giant leap for mankind." He says "what do you think about that?" I said "fabulous." He said "I thought you might like that, but I wanted you to read it." He then added: "It was 'that is one small step for A man.'"' Armstrong had always insisted that he had said 'a,' that it was lost in communication static. This new story however conflicts with what Neil told James Hansen for his biography, stating he came up with the quote on the lunar surface. More on the historic moon landing and the life of Neil Armstrong in the new documentary Neil Armstrong- First Man on the Moon, on BBC."