People get worried when they discover what that yellow substance in your eyes actually is.

When you remove the next crust from the corner of your eye, pause. This crust isn’t a modern-day version: it proves that your immune system has been working hard to silently protect your eyes.

What once seemed repugnant now reminds us that even when we sleep, our body is not asleep. What substance does it contain? When the time comes, it is ready for the night.

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