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#269

From: Paul J Allan
Date: Sun, 26 Mar 1995 04:18

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        This last week my physics students were working on a lightwave
communication unit I do.  One of the students was playing with one of
the pen lasers (Metrologics 6 mA, red) and flashed it on his tongue.  He
said he could taste it (almost feel it.)  I tried it, as did the rest
of the class and sure enough, it produces a "metal-like" taste on most
people's tongues.  Does anyone know why this might happen?
        (Due to the close connection of the nose and tasting, students
tried shining the laser up their noses, but had no sensations.)
        Most students described the laser on the tongue as tasting like
a 9V battery on your tongue, but without the shock.  Any ideas?

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