Located on the tips of our fingers are features known as friction ridges. We evolved them to get a better grip on objects. 

It just so happens that those friction ridges are unique to every person. 

That allows us to use friction ridges as unique identifiers and for authorities to use them to catch criminals, and in some ways, we have been doing so for centuries. 

Learn more about fingerprints and fingerprinting on this episode of Everything Everywhere Daily. 

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