Shades of Tunguska!  (just shades -not even close for size)  Read the weather channel article - now I'm thankful for the close call.  They had some serious nuclear and bioweapon facilities there.  Had it been bigger... , had it exploded closer ......  Loved the joke, it was supposed to arrive December 21, but was delivered late by the Russian postal service  lol  Maybe if the Mayans were still a civilization ...... They're lucky they got off so lightly.  I recall an article from Isaac Asimov about "city busters." Basically how big an object would have to be to destroy a city.  Then he noted, there are a lot more cities now than a hundred years ago. (and the article was written probably 50 years ago)