What is the iron lung and how does it work?

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This man spent an unbelievable 71 years inside an iron lung—without taking a single natural breath. His name was Paul Alexander, one of the last survivors of the polio epidemic. The virus paralyzed his body when he was just six years old. Since then, the iron lung became his only way to breathe. It uses air pressure to pull and push air from his lungs mechanically. For over seven decades, he lived, studied, worked, and even became a lawyer—all from inside the machine. Every sound of that motor k