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New research on Tunguska finds such events happen less often than...

Brace for impact — Eyewitness: "Suddenly the sky appeared like it was split in two, high above the forest." Jennifer Ouellette - Jul 17, 2019 11:56 am UTC Enlarge / The famed Tunguska event of 1908 scorched a five-mile swath of trees and caused many to fall away from the center of the blast in…