How does the PORTACOUNT work?

The PORTACOUNT works by measuring the concentration of microscopic dust particles in the ambient air and then measuring the concentration of those dust particles that leak into the respirator. The ratio of these two concentrations is called the fit factor. The HEPA filter cartridges stop essentially all the particles so anything that gets into the mask must have come through the face seal.

See Application Note ITI-048 PORTACOUNT Plus Theory of Operation. More.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.