Why do humans shed emotional tears, and why does our nose run when we cry? In this episode of Explain It Like I’m 5, Alex breaks down the science of crying: the three types of tears (basal, reflex, and emotional), why humans are the only species that cry from feelings, and how crying acts as an emotional release valve for your brain and body.

Learn how tears flush out stress, trigger endorphins, and serve as a biological SOS signal that brings people closer. We also explore why crying is contagious, how culture shapes when we cry, and why some people cry more than others. Plus: crying from laughter, onions, babies with no tears, and, yes, why your nose always insists on joining the drama.

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