NASA

On an unannounced visit by John F. Kennedy to the space centre at Cape Canaveral in the mid 1960s, Kennedy toured the complex and met a man in overalls. "What do you do here?" he asked. The man replied, "I'm earning a living." Kennedy nodded and moved on. He met another man in overalls and asked him the same question. "I clean away all the rubbish," the man said. Kennedy smiled and strode on until he met another man in overalls and put the same question again. This time a big smile came across the face of the man who replied, "Mr President, I'm helping to put a man on the moon."