Good explanation for the Tunguska event. Glancing blow from an iron meteorite

The 1908 kaboom over Siberia that laid flat 80 million trees may have been a 150 meter iron meterorite that bounced off our atmosphere.  That explains why there's no impact crater and there don't seem to be scraps lying around on the surface.    An ricochet ice meteor would have melted before wrecking the landscape,  a rocky one would have disintegrated and a mostly pure iron one would have vaporized a bit but otherwise held together.
Reported at sciencealert.com