One of the oldest known workplace dangers is breathing in tiny bits of silica, which is basically sand.
http://www.wnyc.org/npr_articles/2013/feb/07/silica-rule-changes-delayed-while-workers-face-health-risks/
http://www.wnyc.org/npr_articles/2013/feb/07/silica-rule-changes-delayed-while-workers-face-health-risks/
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