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    Alle Ding' sind Gift, und nichts ohn' Gift; allein die Dosis macht, 
da=DF ein Ding kein Gift ist.
    "All things are poison and nothing is without poison, only the dose 
permits something not to be poisonous."

Or, more commonly

    "The dose makes the poison."  Paracelcus

I must agree with Ernest.  MC and many other "toxic" substances can be s
afely conducted by students using proper PPE and equipment (ventilation,
 etc).  Having worked in an industry which was one of the top 3 or 4 use
rs of methylene chloride (MC) we found than during the 20 or so year his
tory of MC use the incident of cancer is less than the general public.  
This was also found to be true with the photographic manufacturing indus
try.  Another substance critical to my industry is a known respiratory s
ensitizer yet in a recent study of occupation asthma in the industry ove
r the last 20+ years found a lower incidence of asthma than in the gener
al population.  The positive cancer study in rats exposed to MC found a 
metabolic pathway that exists in rats but not humans or the other test a
nimals which produced the actual carcinogen.  This was ignored when the 
notation was placed on MC.

Is anyone going to stop synthesizing aspirin because of its relation to 
Reye's Syndrome?  Who will stop filling their car with gasoline (10 - 15
% benzene)?  Those deep fried mushrooms will surely do you in (nitrosami
nes and many carcinogens).

Lynn Knudtson

Please note: message attached

From: Ernest Lippert 
To: DCHAS-L**At_Symbol_Here**LIST.UVM.EDU
Subject: Re: [DCHAS-L] Science Education & Safety
Date: Fri, 8 Oct 2010 23:50:35 -0400


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