malachiorion writes: It's no Roswell, but the Tunguska event, a June 30, 1908, explosion that cleared an 800-sq.-mi. swath of Siberian forest, remains a hot topic for the X-Files set. Was it a UFO crash? An alien weapons test? Now, Sandia National Laboratories has released its own explanation for the event. Using supercomputers to create a 3D simulation of the explosion, the Department of Energy-funded nuke lab determined that Tunguska was, indeed, the result of a relatively small asteroid. Even if you don't care in the slightest, the terrifying simulation videos are well worth checking out.