HPC: "What I Learned from Wikipedia" (#2)

This is the second Wikipedia swap I'm hosting. The first one was public, and this one is for HPC members only, but it's the same basic idea, and so I am just going to copy the text from the original swap below.

Here's the original description:

I love Wikipedia! I love learning useless and possibly apocryphal facts and getting into bizarre labyrinths of information by clicking one and then another and then yet another random link from each page that I end up reading, in an endless cycle of fun informational semi-connectedness.

I am sure that many of you other internet junkies out there also enjoy a good several-hour long browse on Wikipedia as well, and so to celebrate that, I have created this swap. Here's what you do:

Go research something on Wikipedia. Anything you like. Pick one random factoid that you particularly like, and make one HANDMADE postcard illustrating that factoid in some way. Then write a little note on the back to your partner explaining why you think this particular useless bit of knowledge is so darn cool. Any media are welcome, but please try to create a card that is well-made and clearly your own work.

Fine print for HPC members:
International swap. Open to all HPC members in good standing. Cards must conform to standard USA postcard sizes - they must be somewhere between 3.5" by 5" and 4.25" by 6".