Grinding operation accident
For those of us who tinker with metal, here's a report of an unusual grinding accident. Guy is grinding metal when he's partially enveloped in a fireball of exceptional heat (deep 2d degree burns). Theory is that iron oxide from grinding iron mixed with aluminum from prior grinding to make a form of thermite. (I suspect it was more of a thermite *dust* explosion, as a pile of thermite wouldn't do up that quickly).