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ELIZABETH CHOE: When
we think of snot,

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we usually think of the
stuff that oozes out

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of us when we're sick, right?

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[SNEEZE]

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It's just more
gross bodily fluid

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that we seem to excrete
for whatever reason.

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But snot is more
than just the stuff

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that hangs out of the noses
of most two-year-olds,

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and some 20-year-olds.

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It's filled with all of these
cells that do everything

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from fighting
infection to keeping

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your esophagus from
ripping up every time you

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try to eat something.

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[CHOKING]

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And that "junk" actually can
keep stuff out of your body.

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And then it knows what to
keep out, what to let in,

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and when to do it all.

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What?

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That is so crazy.

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Snot and mucus is so
important that your body

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makes a gallon of it a
day, which is disgusting.

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But then I think about it more,
and I actually would rather

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keep all that around.