WSJ's Katherine Rosman has the story of scientists learning more about how and why humans cry. Specifically, why men and women cry differently.

You first feel your bottom lip tremble as your work is critiqued in a meeting. Or maybe it's a clenching of your jaw. Or perhaps there is no warning at all. One moment you're composed and the next … waterworks.

We can alter the shapes of our bodies, slow the signs of aging and learn to control our heart rates. Yet we're often powerless when it comes to crying.

Some...