What is the iron lung and how does it work? | BBC News

The polio survivor, Paul Alexander, lived inside an iron lung for 70 years. He died at the age of 78 and contracted polio in 1952 when he was six, leaving him paralysed from the neck down. But, what is an iron lung and how does it work? Subscribe here: http://bit.ly/1rbfUog For more news, analysis and features visit: www.bbc.com/news #Polio #IronLung #BBCNews