Actually, this discussion is headed no where unless one of you gents in the US heads to your local library and checks out that book I linked for you. If I were in the states, I would certainly do such on one of my days off. But here in Japan, I have no library access to English books, other than the likes of Dr. Seuss. I wasn't able to dig up anything online either, although I only Googled for about 30 minutes.
Since this is a Vintage Computing forum, I think the topic of "silicon chip aging" is quite relevant for all of us, albeit not the main thrust of this particular thread.