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One of the most crucial discoveries in 20th century medicine may not have happened when it did,

if not for some snot on a petri dish.

This is Christopher and Taliatta and you're listening to Scientific Americans Science Quickly.

Today I'm taking you on part two of a three-part journey into the deeply sticky and fascinating subject of slime.

We make our way into inner space, into the human body, where the mucosal miracle lives.

Now, back to that snod in the petri dish.

The snot came from the nose of a Scottish physician named Alexander Fleming.

Now, in November 1921,

Fleming had a cold. Fleming was, at the time, a lecturer in bacteriology at St. Mary's

Hospital in London. And he wondered what would happen if he added some of his nose or mucus to a

bacterium he was studying. This, by the way, is Kevin Brown. He's curator of the Alexander Fleming Laboratory Museum in London.

He spoke to me from his office, where he has a prized piece of furniture.

And you can just see the top of an armchair,

and that was a leather armchair, which had been used by Fleming himself.

Oh, wow. So you have Fleming's armchair in your office?

I do, yes.

It's too big for the museum.

...