"Body parts that differentiate humans from each other. What comes to your mind?"
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You may have heard that every human being has different fingerprints, even identical twins. Quoted from Medical Daily, there are several other body parts that differentiate you from the 7.7 billion people in the world.
1. Tongue
You know that the size and shape of each person's tongue is different. A person is known to have small lumps containing more than 10,000 prases on his tongue. These lumps are also filled with microvilli or microscopic hairs. Apart from fingerprints, in one study, tongue prints could potentially be used as a forensic biometric tool.
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2. Ears
What differentiates your ears from other humans is their shape, including the curve on the earlobe and the edges. Mark Nixon, a biometrics expert from the University of Southampton shows that 99.6% of the time the ear shape is very unique and can differentiate a person from another when he wants to. Nixon also said that age will not change a person's ear patterns, unlike fingerprints which can change due to injury, for example. Changes will occur in the earlobe (slightly decreasing with age), but the overall shape remains the same.
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3. Eye
The iris is a muscle in the eye that is located behind the cornea and functions to regulate the size of the pupil as well as give color to the eyeball based on the amount of melatonin it contains. The color and structure of the iris are formed by DNA when it is in the womb. The gaps (circles) of the iris are different for each person due to the degeneration of the tissue membrane which is folded before a person is born. This is what makes the unique structure of the iris form.
