I got an impression the other day. It wasn't a verbal impression, but I will try to put it into words: the molecular weight of a soul increases the more it is encrusted with ego, and decreases the less it is encrusted with ego...the souls of a lighter molecular weight can rise to the superior worlds..those of a heavier molecular weight sink into the abyss. I don't know why the phrase "molecular weight" was the first one that came to me upon verbalizing the impression. Is there any realistic basis to this?