ELI5: Why do most human fluids dry hard, but tears don’t?
Mucus, spit, vomit, etc., will all dry onto fabric in a hard/crusty texture. But you can wipe away tears with your clothing and it leaves no trace. Why is that?
Mucus, spit, vomit, etc., will all dry onto fabric in a hard/crusty texture. But you can wipe away tears with your clothing and it leaves no trace. Why is that?