While you may not know it, you actually possess some unique body parts that no one else does except you! Surprised? The fact is you possess certain special characteristics that separates you from the other 7 billion people that populate the world.
The iris, a muscle that opens and closes the pupil to control how much light enters the eye, has tiny textural patterns. DNA determines the colour and structure of the iris, but its random pits, furrows, swirls, and rifts occur during fetal development.
All these makes every iris unique (even your two irises don’t match each other). The patterns are thought to appear as the foetus opens and closes its developing eyes, and iris tissues tighten and fold.
The retina, is also unique to you. It displays a pattern of blood vessels that your eye doctor observes to detect the first signs of diabetes, high blood pressure, and even declining brain health.
Though human retinas are typically only observed by optometrist, retina identification is widely used in the animal world to track disease outbreaks.
Your gait is not really your feet but how you use them. Even if you’ve never noticed anything unusual about how you stroll, some machines do. When an international team of bioengineers analyzed the foot pressure patterns of more than 100 participants, they identified individuals with a 99.6 percent accuracy rate.
While more research is needed, gait identification could eventually be a way of identifying individuals from a distance.
If you trace the rim of your ear, you will most likely feel the curves and ridges but you most likely don’t know that you are the only person in the world with that exact shape.
Researchers in one British study developed an algorithm that could identify a single individual out of more than 250 others with a 99.6 percent accuracy rate by analyzing how light reflects off the curves of the ears.
Based on the unique features of the ear, Yahoo is developing technology to unlock smartphones with an ear scanner. Someone receiving a call would unlock the phone by simply pressing it to the ear.
A study published in the Journal of Forensic Dental Sciences found that the pattern of elevations and depressions in the lips are as unique as fingerprints.
Like fingerprints, the tongue has its own shape and texture, and its tiny bumps and ridges are distributed in a way that is unique to you only. These patterns rarely change over time since the tongue is protected inside the mouth and these has led to researchers developing 3-D tongue imaging to aid in identification.
While this is not a body part, your voice is unlike any one else’s. Some vocal characteristics such as frequency (high or low) and intensity (loud or soft) are easy to detect. Other traits, such as tightness, resonance, or nasality are usually more difficult to pinpoint.
An individual’s unique vocal tract is partly genetic and partly learned. The length of one’s neck and the width of the pharynx plays a part, the same way learned characteristics such as lip rounding and vowel pronunciation does.
Based on these combined traits, scientists have already created systems to automatically recognize a person’s voice if it is pre-recorded in a database.
The toe prints of a foetus develop at the same time as fingerprints, and are just as unique.
Your teeth not only reveal your DNA—which is why dental records are often used to identify bodies—but are particular to you based on your personal habits.
Maybe you clench your jaw, grind your teeth, or play a musical instrument. Because of this environmental wear and tear, even identical twins have different sets of teeth.