What is the iron lung that kept 'Polio Paul' alive for more than 70 years — and how does it work?

By James Liddell

Paul Alexander spent a staggering seven decades relying on his iron lung for survival.

Doctors said "he shouldn't be alive,” after he contracted polio as a six-year-old. But his seven-foot-long ventilator stamped him in the history books as a medical marvel and hel

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