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You Can Produce Three Types of Tears


Image credit: TED-Ex/YouTube

You may not know that your eyes would be able to produce tears constantly, even if you do not cut onions or watch Titanic.
In fact, people could produce three different types of tears— basal, reflex, and emotional. It is not difficult to understand basal tears and reflex tears, because they intend to keep our eyes protected from debris or wash away some substances and microorganisms which are regarded potentially harmful. However, scientists are now at the initial stage to explore the reason why people produce emotional tears, whether it is the way to release hormones, or it is more likely to be a social signal. The answer is yet to be found.
This video here presented by TED-Ed would tell you something about the science behind sobbing with an animation of Iris, the iris.