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What is Your Snot Saying?
Season 4
Episode 2
We explore the science behind your snot. There's a lot of chemistry going on in your phlegm. This germ-fighting goo contains cells and chemical compounds that help us power through a cold. You can also think of mucus as a traffic light for your health - what turns up in our used tissues can be a useful clue about the inner workings of our immune systems.
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