Which is older?.

I learned today that Oxford University isvoldervthan the Aztec Empire, and my brain immediately refused to accept it. That one fact send me down a ridiculous historical rabbit holebi started reading about Oxford, then the Aztecs, then mediaeval Europe and somehow ended up leaving about ancient plumbing. What began as one random facts became an hour of jumping between centuries. History is dangerous when you are wondering how people lived without Wifi.