One source says ” In 1662, a Danish scientist named Niels Stensen discovered that the lacrimal gland was the proper origin point of tears” Stensen’s theory was that tears were simply a way to keep the eye moist. However, that approach didn’t quite account for the emotional aspect… There are some other theories out there, one being that tears trigger social bonding and human connection. According to the same source, ” While most other animals are born fully formed, humans come into the world vulnerable and physically unequipped to deal with anything on their own. Even though we get physically and emotionally more capable as we mature, grownups never quite age out of the occasional bout of helplessness. “Crying signals to yourself and other people that there’s some important problem that is at least temporarily beyond your ability to cope”.