The end of the year seems like as appropriate a time as any to take a deep dive into how and why our calendar got to be the way it is. And while you may have some of these facts scrambling around in the dusty recesses of your brain somewhere, I promise you've never seen them so lithely illustrated.

My one quibble: the quick dismissal of the Mayan calendar apocalypse theory tacked on at the end. A LITTLE TOO CONVENIENT IF YOU ASK ME. Clearly NASA is behind this. [Jeremiah Warren via The Daily What]