Psychological fact: when a person cries and the first drop of tears comes from the right eye, it’s happiness. But when the first roll is from the left, it’s pain. Crying reveals a person’s mood, but its evolutionary origins have long been a mystery. Because emotional tears have a different chemical makeup than those evoked by irritants in the eye, cognitive neuroscientist Noam Sobel of the Weizmann Institute of Science in Rehovot, Israel, wondered whether emotional tears relay chemical mes­sages to others.

There’s a distinct melody to the way people cry in different cultures … Newborns come into the world all crying the same way, according to a German study published last year in the journal Current Biology. But as they grow up, they’re socialized to a culture’s specific manner of weeping. Society has always compared rain to falling tears, which has led to many believing the shape of raindrops to be in a similar shape. In fact, they are not at all. When a raindrop begins to fall it starts in nearly a perfect circle, and then begins to change in shape.

Wondering Why your nose runs when you  cry?

It all starts with your lacrimal glands, located on the outer portion of the upper eyes. These peanut-shell-shaped glands create and secrete tears. Most tears will flow over the surface of your eyes and drain out the corners of your eyelids, through the tear ducts, which lead into the nasal cavity. If you cry an abundance of tears, the tears overflow the nasal cavity and start running out of your nose.

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