Newly published research results suggest some sort of major airburst occurred in the right time and place(s) to have initiated or aggravated the decline of the Hopewell mound builder culture.
FULL STORY...
Some dramatic impactor events don't seem to involve much or any physical impact of an incoming body on the ground (e.g., the Chelyabinsk meteor).
Other enigmatic airburst / air burst events have been discussed as Fortean cases. These include:
Tunguska...
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