Six missions after Apollo 11 amazed the world by going to the moon, Apollo 17 was the last trip.
It fell off the cultural radar. Flying to the moon, driving around and getting back safely wasn't interesting enough, apparently.
And the miracle of the internet, which connects billions of people, instantly, is something we all take for granted after less than a generation.
Is it any wonder that your magnificent Facebook post or clever tweet isn't racking up ever more likes?