This video shows why you cant always trust all information on the internet, as well as shows the basics of torque wrenches and a few oddball calculations you might run across when building custom things.
Underground mine ventilation. Underground mine ventilation provides a flow of air to the underground workings of a mine of sufficient volume to dilute and remove dust and noxious gases (typically NOx, SO2, methane, CO2 and CO) and to regulate temperature.
Bag-valve mask (BVM) ventilation is a life-saving skill that can easily be overlooked because of its apparent simplicity. Poor BVM ventilation technique can lead to the need for more invasive means of airway management and their inherent complications.