I think they are set up or structured differently to email groups such as this. 
 I don't really know to be honest, all I know is I expect and accept losing any 
privilege to privacy, anonymity or whatever the instant I hit the keyboard.  In 
fact, truth be known, the reason I joined this group was probably because I 
stumbled across those same archives when searching for the more intelligent 
discussion groups involved with EIS/CS.  I liked what I read and joined.
N.

Date: Mon, 6 May 2013 05:50:10 -0700
From: ptf2...@bellsouth.net
Subject: Re: CS>http://www.citytrend.ca/html/npzym.html
To: silver-list@eskimo.com

Thanks Nevile.  Why aren't yahoo groups published the same way?
PT