I listened to a lot of the show early this am....pretty damn good. I think I will have to get the book.
I had no idea the Siberian explosion was a comet and/or that it exploded in the air above....makes a lot of sense.
Yes, it was probably a comet, although the difference between a comet and an asteroid is getting murky the more we know about these things. Whatever it was exploded high in the atmosphere above Siberia but the flash was seen in London so bright you could read a newspaper at midnight. As to the rest of the author’s conjectures, they are his and he is welcome to them.