******************************************************************************************** A note about the links in this
site:
The Internet is alive. From time to time, Web page
administrators
will change links to pages, move things around, and delete
stuff.
This can be very frustrating to a person viewing a page like this
one
since if the author does not continuously update his site and
check all
the links, interesting, useful and important information may no
longer
be available. Sometimes, old copies of what used to be at a
Web
site are archived at [give like, “waybackmachine”?] or Google
sometimes
has a "cache" copy when you do a search. I have tried to
include
enough of an excerpt of the original web document to be able to
find it
should the link I provide become invalid.
Questions
or
comments,
contact
"perpetualcommotion.com"
at
gmail.com