....that make us feel really small. If you could look out the window from the Messenger spacecraft the other day, you would have seen a bright "star" in the sky. It ends up that what you were looking at was the home of the spacecraft from 114 million miles away. That little dot next to it is the moon - the farthest distance any human has been from Earth. So you look at the little bright spot (I assume it would appear blue in person) and realize that everyone you know, all of history, wars, discoveries, inventions, web pages, travels, exploration, jobs, worries, animals, every little tiny bit of human history......all happened right there on that tiny bright spot.
If that doesn't make your brain go "ping!" nothing will.