All this week the nasa.gov website is broadcasting in real time the original radio communications of Apollo flight 11, the first moon landing. Currently, they are 40+ hours into the flight, with 70+ hours to go. What you hear are long stretches of silence, then long blocks of technical talk, systems checking, plus some humor. While eating lunch the astronauts were making fun of the names of their meals by referencing the gov/mil description - Salad. Mixed. Salmon. Good. At one point Houston control asks what the noise in the background is. Answer: Buzz Aldrin singing.