Why do we cry when we are sad ?

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                             There is no one in this world who hasn't cried. We cry when we are sad, when affected by dust or a rogue eyelash. The area of your brain that deals with your emotions is called the  hypothalamus. When stimulated by something sad, for example, (or anger, pleasure or physical pain) the hypothalamus signals the release of a kind of hormone (chemical messenger) that triggers a gland near your eyes to make tears. We don’t know exactly why tears—rather than anything else—are produced when you are sad. Perhaps it’s a form of non-verbal communication (“speaking” without using words), indicating you need the help and support from people around you in your time of need. Alternatively, tests shows that you simply “feel better” after you cry.

Facts about crying and tear that you don't know !

1.  Even when you’re not crying, your body generates 1-2 microliters worth of tears.

2.  Your nose stops up when you cry because excess tears come out of your nose.

3.  In general, women cry more often than men. The estimated number of times a woman emotionally cries is 50 times per year. Men do it on average of 10 times per year … although they tend to deny the act on many occasions.

4.  Babies spend about 1 to 3 hours of  every day crying.
                                                                                      
5.   Scientists believe emotional tears may be an evolutionary adaptation. Tears can provoke empathy or aid from other human beings. They can foster a sense of unity among a group of people mourning the same loss.

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