50 years ago this week, astronauts Neil Armstrong and Edwin "Buzz" Aldrin became the first men to set foot on the lunar surface. Hear the CBS News special coverage from "CBS Evening News" anchor Walter Cronkite as he guides America through the historic first steps and ceremonial planting of the American flag. In a recent interview, command module pilot Michael Collins, who continued orbiting the moon while Armstrong and Aldrin explored the lunar surface, tells CBS News' Mark Strassmann why he didn't feel lonely as the only man floating in space and didn't envy his fellow astronauts. Plus, flight director Gene Kranz recounts the tense final minutes of descent to the moon as data and communications were failing in mission control.