First Tunguska event?

[Markekohut]

F
> 
> 
> 	New Scientist (@newscientist)
> 1/22/13, 12:35 PM
> Mystery 8th-century tree rings hint at close-range #space blast bit.ly/V4wUuM
> 
> Download the official Twitter app here
> 
> 
> Sent from my iPad
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