The Kopp-Etchells Effect by Michael Yon

Paying tribute to two veteran warriors who died in Afghanistan, the Kopp-Etchells effect refers to the halo glow which can sometimes be seen in Helmand Province. In his blog, Michael Yon, who named this effect writes:“Basically it is a result of static electricity created by friction as materials of dissimilar material strike against each other. In this case titanium/nickel blades moving