Tunguska Incident is 100 years old.

Yes, it's been a 100 years since the famous Tunguska incident. And although the scientific community (the mainstream, that is) maintains that the only plausible cause for the event must have been a meteorite 40 meters across, over the years numerous researchers proposed various alternatives, the most popular being the alien craft explosion theory, the mini black hole theory, and last but not least the Nikola Tesla Death Ray theory.
Coincidence that Tesla was working at his Death Ray at the time, and destroyed all his notes immediately after the Tunguska incident? Maybe it is...