Yawning is contagious; you might even be yawning while reading this.
Likewise, they don’t know why oureyessometimes water when we yawn, too.
But theydohave an idea.
Why do our eyes produce tears in the first place?
A mucus-based layer attaches to the water in youreyesto keep them moist, too.
Why do our eyes sometimes tear up when we yawn?
As Dr. Massaro-Giordano notes, “All that extra fluid has no place to go.
