Why Do You Know That?

Been a while since we've had one of these. It's the converse of "Auto Mechanics to Quantum Mechanics" where you provide everyone with those tidbits of useless knowledge you have stored away for no good reason.

My contribution:

The capital of West Virginia was originally named Charles Town until they were informed that there already was a town in West Virginia named Charles Town (over by Harpers Ferry) and so they shortened it to Charleston.

So what do you know and why do you know that?