Light-induced sneezing and Argon effects

[Paul D Boyer PhD]

I've received a question from a student in my "Nature of Life" course
about the association between light and sneezing which I thought merited
a search for information.  Does anyone know why it is that light induces
sneezing???

Another question is whether there are any side effects from breathing
Argon gas.  This is a case of industrial exposure, where the tank warns
that inhalation should be followed by removal to fresh air, and if not
breathing, give artificial respiration.  Sounds a bit threatening, but I
also know some manufacturers are a bit overzealous in their warnings. 
Anyone have any comments?

Thanks!
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Paul D. Boyer, Ph.D.                University of Wisconsin-Parkside
Assistant Professor                          900 Wood Road, Box 2000
Biomedical Research Institute                Kenosha, WI  53141-2000
College of Arts and Science                         boyer at cs.uwp.edu
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