[GOPJ]

Like soon there won't be any blondes? Then again, there is a lot of water...

"I would think that if 30 astronds hit with this sort of impact each year that a city would have disappeared by now."

[Robert A Cook PE]

I'm thinking maybe, just maybe, that somebody scrweed up the editting ...

Maybe the original quote (from some "reliable source" had a "total mass" of 30 asteroids hitting the world ... adding up millions of dust-sized particles could acrrue a lot of mass, but none of it important as far as a "collision" goes.