hydrogen fluoride

On August 27, a graduate student at Hokkaido University in Japan was splashed with hydrofluoric acid (aqueous HF) while working in a Faculty of Science building. The student suffered severe injuries and later died at the hospital.

A friend of mine has been a volunteer firefighter for 48 years. He doesn't scare easy. He estimates that he's helped put out 500 fires, running into burning buildings some of the time. That doesn't faze him either.