< br />It was only 50 years ago, on July 20th, 1969, that Buzz Aldrin and Neil Armstrong became the first humans to actually set foot on the lunar surface -- something that just ten years prior had been unthinkable. More than 600 million people around the world listened as Armstrong spoke these immortal words: "One small step for man, one giant leap for mankind." Watch the clip to hear Glenn tell the story and bring the historic day to life.