Alex Gendler: Why do we cry? The three types of tears

Whether we cry during a sad movie, while chopping onions, or completely involuntarily, our eyes are constantly producing tears. Alex Gendler tracks a particularly watery day in the life of Iris (the iris) as she cycles through basal, reflex and emotional tears. [Directed by The Moving Company Animation Studio, narrated by Addison Anderson].

Sonraki bölüm

S2014E27 - Rose Eveleth: The science of spiciness