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Of the 7.7 billion people on Earth, why does no one have a face that is 100% identical?

According to the United Nations World Population Outlook (UN), the world population is currently around 7.7 billion people. This number is forecast to increase by 2 billion people by 2050.

However, have you ever asked a question: Out of the billions of people living on Earth, why cannot we find two faces that are exactly the same even in twins and twins. triple? In fact, we can see 2 people with the same “hao hao” traits or similarity in structure of eyes, nose, ears or mouth, but can never be 100% like everything.

So what factors make each of the nearly 8 billion people have a different face?

Basically, your identity is “written” on your face. In view of nature, very few animals with distinct faces like us humans – even other animals such as crows, pigeons, dogs and bees can recognize and distinguish this human face from another person’s face.

According to researchers at the University of California Berkeley (USA), our facial diversity is the result of evolutionary pressure to ensure that all humans easily recognize each other.

“Humans have an extraordinarily good ability to recognize faces; there’s a part of our brains that specializes in that task. Our research shows that humans have evolved to be unique and easy to use. If not, we will all look more alike. “, the team said.

Of the 7.7 billion people on Earth, no one has a face 100% the same.

To see if our faces changed by accident or by natural selection, researchers at the University of California Berkeley analyzed anatomy statistics from the US Army database. They also looked at the 1000 genome project data, which has sequenced more than 1,000 human genomes since 2008 and cataloged nearly 40 million human genetic variants worldwide.

After the analysis, face detection experts are the most special part. This means that genetics have certain effects on body features such as height and weight. However, the manipulation to form a face does not follow any certain rules. This is a unique part completely different in each person, no one is the same and can be considered as a natural identity card of each individual.

To clarify this, experts have continued to study and analyze the genetic sequences of many people on different continents, focusing primarily on 59 small segments of DNA that regulate facial features. As a result, they found that these tiny DNA fragments had a much more complex variation than other DNA fragments that regulate height, weight, and other morphology peak.

The study also showed that features such as forehead-chin distance, ear height, nose width, and distance between the eyes vary more than non-facial features. The most variable features found in the “triangle” include the eyes, nose, and mouth.

So why did humans evolve like this?

The real solution lies in the evolutionary process that humans go through. Specifically, traits that help people survive better will be retained and developed. The researchers even compared the DNA of Neanderthals and Denisovans – two extinct cunning human beings, to today’s human DNA. As a result, they found that the diversity of the human face is a long-evolved trait.

In the wild, many animals rely on smells or sounds to recognize each other, without the need for special facial features. But the human being is a kind of observable and highly social species. So it makes sense for us to focus on evolution on faces. Being easy to see has many different benefits. For example, it can prevent someone from confusing you with his enemy, or ensure that someone with a similar face you cannot take over your property.

Of the 7 7 billion people on Earth why does no one have a face that is 100 identical | Discover

The diversity of human faces is a feature that has evolved for a long time.

Most modern humans are capable of recognizing various objects with 97.53% accuracy, except for a few people with “blind face” syndrome that makes them unable to recognize faces. of others as well as our own. More detail, distance, size, and thickness of the eyes, nose and mouth are the characteristics that help us best distinguish one person from another.

For comparison, most animals (not humans) have relatively uniform faces, as they use other markers such as scents or emitted sounds to distinguish one another. However, there are still some animals that have similar abilities to humans. A 2011 study by the University of Michigan (USA) showed that paper wasps have the ability to distinguish each congener due to facial features as well as unique colors of each individual.

Refer to TreeHugger

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