In some materials, the absorption of a single photon can trigger a chain reaction that produces a large burst of light.

http://collaw.instructure.com/eportfolios/55509/Sustanon_Deca_Anadrol_Cycle_Test__Dragon_Pharma__Injectable_Steroids
http://courses.ecornell.com/eportfolios/24804/Pharmaton_Drugs_Side_Effects__Boehringer__Vitamin_Shots

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