What's a long-standing mystery that still preoccupies you?
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Tunguska Event:
https://en.m.wikipedia.org/wiki/Tunguska_event
What's the mystery with this one? It's a very interesting event, but isn't it generally pretty well understood?
Generally considered a meteor air burst, but there's no crater and no evidence so it's still very mysterious.
Oh ok, thanks. Didn't realise that, will need to read up on it.
I've read interesting conspiracy, that Tunguska incident overlaps exactly with Nicola Tesla's attempts to wireless transfer of energy. Was an interesting idea and read, even though very unlikely to be based on real event.