Interesting video and simple explanation that will help us learn how to properly get a dust mask, or a semifacial. The video was edited and prepared by OSHA and is narrated in Spanish

The National Library of American Medical has created a course online and free ( see here ) for the sole purpose of disseminating basic knowledge in toxicology.

This first of December will change the labels of chemical products, from R risk phrases and safety advice S, H phrases (equivalent to R) and advice (P)
CLP LABEL

to a chemical accident:

Source: ChemSafety

On December 19, 2007, four people died and 13 others were transported to the hospital when there was an explosion at T2 Laboratories Inc. for the production of a gasoline additive called methylcyclopentadienyl manganese tricarbonyl. Research paper here (English)