Unique sign of each person

Each iris pattern is unique, unlike anyone; Left and right iris of the same person are also different.

The iris is the mechanism that controls the opening and closing of the pupil, controlling the amount of light entering the eye, and has very small structure patterns. While DNA determines the color and structure of the iris, the swirls and wrinkles that make up the uniqueness of the iris are formed since each individual was an unborn baby.

Each person's iris has patterns that do not match.(Photo: Healthy).

Retinal

There is a randomly arranged network of blood vessels in the retina, so no two people in the world have the same retina. Doctors often look at the retina to detect the first symptoms in some patients with diabetes, high blood pressure, and impaired brain.

Helix

The creases and grooves in each ear are different. British scientists designed an algorithm that can identify individuals, successfully identify any one of a group of 250 people by analyzing an image that reflects the light of the ear canal, the exact ratio being 99.6%. Yahoo, one of the major software developers in the world, has been researching and developing technology to unlock smartphones by scanning the ears.

Tongue

Like fingerprints, the tongue has its own shape and texture, small dots and ridges on the surface of the tongue are distributed in a way that does not coincide with anyone. The arrangement of the tongue spots and veins is almost unchanged over time due to the protection in the oral cavity. Scientists are studying 3D tongue image design to aid identification.

Teeth

Teeth not only contain DNA information, dental records are often used to identify human remains, but also have a unique model that doesn't match anyone in the world. This uniqueness is caused by the habit of each person, such as clenching their jaws, grinding their teeth, playing musical instruments like the flute, the trumpet, . formed. These external effects cause teeth to erode, so no one has the same teeth, including twins.

Lip prints

A study published in the journal Forensic Dental Sciences found that small wrinkles on the lips are as unique as the pattern on fingers and toes. Based on this feature, criminal science has applied research into real life, thereby solving many criminal cases. The US court has used lip print to investigate criminals.

Footprint

Footprints, fingerprints formed from the fourth month of pregnancy, are unique characteristics of each person.(Photo: Healthy).

Footprints form, develop in the fetus between 13 and 19 weeks of age. Like fingerprints, they are patterned and unchanged throughout life. Some scientists think that fingerprints are a good way to save individual biometrics because fingerprints are less likely to be blurred; people often use bare hands in daily activities, while the Large time wearing thick sandals when moving.

Crooks often leave the fingerprint scene, and the Federal Bureau of Investigation maintains a national database that links 66 million people with their fingerprints, but no fingerprints are stored. In a classic case, a Scottish court successfully convicted a thief who sneaked into a bakery after only 15 minutes thanks to the fingerprints left on his restaurant window.

Voice

Although not really a part of the body, the voice is a unique feature of each person, as evidenced by today's speech recognition technology. Pitch, voice pitch can be easily recognized, but some other features such as thickness of voice, nasal voice . are harder to detect. Each person's unique voice is a combination of a genetic part (such as the length of the neck and the width of the throat) and a learned part (like how to round lips, how to pronounce vowels).