I've been wasting a lot of time recently reading up on the various space missions on Wikipedia, and it's become clear to me that there's a ton of stuff that I had no knowledge of. For example: the Fallen Astronaut memorial left on the moon in 1971, the Apollo 15 postage stamp scandal which involved Apollo 13 astronaut Fred Haise, and the moon trees grown from seeds that were taken on Apollo 14 (one of which is in Washington Square; I know what I'm doing next time I'm in the city).
Also did you ever stop to think that people have walked on the damn moon? Crazy.
UPDATE: I forgot to mention the icon that Google street view is using today.