On December 21st exactly 50 years ago, America agreed to sell Polaris missiles to the UK. Nothing happened this year though.
No volcanoes, no tidal waves, no Nibiru (planet X), no galactic alignment, no alien visits, no nothing. Mayans sacrificed virgins at the altar, so I guess it's safe to say they're wrong about other stuff too.
I assume the Mayans just got bored, making a long calendar and all. And the scientists fed into it. Lol