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Just read this and found it quite interesting. http://newscenter.berkeley.edu/2014/03/18/fierce-solar-magnetic-storm-barely-missed-earth-in-2012/
Apparently we got missed by a huge sun-storm in july 2012.
In the article it says, that studies have calculated the amount of possible damge with up to 2.6 trillion $.
And accoirding to the article, events like that happen more often than scientists thought up to now. The chance that a storm like the one in 2012 will hit us in the next 10 years are about 1/8.
Pretty crazy in my opinion.