More Than 7 Billion People Populate Earth And Each One Has A Unique Face — Here's Why

Over 7 billion people populate Earth and each one has a unique face, which is pretty atsonishig when you think about it. Why do human faces have such great diversity? A new study suggest it isn't just because we are more attuned to human faces -- it's also because humans actually have more diverse and unique faces than another animals species. When you meet someone new, what do you do you notice about them? Their clothes, height, and hair color are some of the traits that set us apart, but it's the person's face that you remember and recognize in the future.

We can thank our brains and our advances social structure for this diversity. A crucial evoltuionary trait in our brain has played a part in generating more diverse, complex, and unique faces in human beings. That's in comparsion to most other animals that do not rely on sight to recognize one another -- instead they use sound or smell; King penguins spot one another in a crowd with a unique vocal call while dogs use their incredibly sensitive noses to sniff.