How a Pig Bladder Became a P100 Filter

We're pulling the mask off PPE. This episode traces respiratory protection from first-century Roman miners using animal bladders to plague doctors' beaked masks, through the chemical warfare innovations of WWI, and into 3M's rise from a failed mining venture to the dominant force in disposable respirators. We break down how NIOSH ratings actually work — why 0.3 microns is the hardest particle size to filter, the electrostatic charging breakthrough that made N95s breathable, and the massive gap between brilliant filter engineering and the fit testing problem that leaves most wearers unprotected. If you've ever worn a mask and wondered whether it's actually working, this one's for you. Episode #990069 — open it directly at myweirdprompts.com/990069