how do fingertips work? What makes them so unique and why they generate on the fingers and not other parts of the body?
In: Biology
As others have said there’s other parts of your body that are unique so I’ll try to explain why they’re unique. Imagine you have a picture of a thumb print. On that picture you pick 100 points and measure the angle/direction of the print and its relative height. If you round to the nearest 10° and assign binary to peak or trough height, there would mean there’s a theoretical maximum number of possiblities of (2*18)^100 or 0.42*10^156 (42 followed be 154 zeros). Theres been an estimated 120 billion humans to ever live or 0.12*10^12. So there’s way way way more possible thumb prints than people to have ever existed. There are common patterns in prints that means the real number is much smaller but you start with so many possibilities that it doesn’t matter. You’re fingerprints are like QR codes, they all kinda look similar but it’s the little differences that make them so unique.
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