how does our lungs clean themselves from small things that get in them like dust?
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Boogers and coughs.
The other folk have the more scientific explanations, but when you clear your throat, the gunk thats moving around has all the little nasties trapped in it.
Ever notice how gross your boogers are after spending a day in a busy city? I notice it especially after being in London and travelling on the Tube (Subway) throughout the day. Your nose is like one of those sticky fly traps but for the particles you mention instead of bluebottles.
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