Update: A quick shout-out of "jinx!" to Jeff Soyer, who blogged the exact same story about twenty minutes before I did. Only discovered it tonight; it seems we have similarly-tuned debunking radar.
Apolinario Chile Pixtun wants you to chill; 21 December 2012 is not The End Of Everything. "I came back from England last year and, man, they had me fed up with this stuff." As gen-u-ine Mayan, an elder who takes local history seriously, he's in a position to know.
Sources interviewed include astronomers and anthropologists and the gist of it is, yes, the Maya were some hot-shot naked-eye astronomers and their math was good, too; but projecting from their cultural take on the date to our own results in, if you'll pardon the term, ignorant gibberish. There are a number of interesting astronomical alignments on the date in question but the Mayan calendar keeps on clicking after it, with more predictions for later dates.
If you wanted a new excuse to restock MREs, water, batteries and so on and if your hippie friends and relations are good with 2012 as a reason, okay-fine. Just remember preparedness needs no special excuse; ordinary, everyday and far more likely disasters like floods and hurricanes, tornadoes and ice storms will find you firing up the generator and setting up the catalytic heater, happy to have water on the shelf and beans and rice in the pantry.
(In other news, Water Found To Be Wet!)
Introduction to Sim
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