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Additional deleted.
Humans, for various psychological reasons, always want to know
/why/ something happened ... and they are forever cooking up
ways of explaining why. Most of this is baloney. On the other
hand, there is such a thing as cause and effect. The guys who
know the most about this aren't the physicists; they're the
epidemiologists.
http://www.ph.ucla.edu/epi/snow.html
http://en.wikipedia.org/wiki/John_Snow_%28physician%29
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