Ever wondered why humans have white around our eyes (the sclera), something rare in the animal kingdom? A paper published in Social Science Research Network (SSRN) says it’s all about social connection and trust.

Early humans evolved visible white sclera so others could easily see where we’re looking, helping groups understand each other’s emotions and intentions (called the “friendly eye” hypothesis). This helped reduce conflict, build stronger tribes, and made cooperation easier.

Facial expressions and eye contact became key for survival, love, and trust, especially as violence within groups became less accepted. Over time, more expressive faces helped people attract mates, make friends, and form alliances.

So the next time you raise an eyebrow or lock eyes with someone, you’re tapping into an ancient survival superpower!