Another day, another notable anniversary. Today marks 40 years since Neil Armstrong first set foot on the moon (seen in partial eclipse in the picture to the left, from 2/2008). One could say that was the culmination of the engineering and sweat that was launched when JFK issued his challenge of "landing a man on the moon and returning him safely to the earth" in his special message to a joint session of Congress on May 25, 1961. However, it was also the start of what some still consider the glory days of space exploration.