Crying has fascinated mankind for millenia. Since ancient times, we have known that emotional tears are a unique human characteristic. Unsurprisingly, over hundreds of years, scholars from different backgrounds have speculated about the origin and functions of human tears. According to Charles Darwin, tears fulfilled no adaptive function. And yet, this seems in sharp contrast to statements in the popular media about the significance of crying. Crying is thought to bring relief and is considered healthy - and withholding tears unhealthy. In addition, tears have been said to inhibit aggression...