Summary
Highlights
Fingerprints have been the gold standard of forensic science for nearly a century due to their unique nature. They are one of the earliest features to develop in the womb, influenced by amniotic fluid pressure and finger growth rates. These numerous factors ensure that everyone's fingerprints are unique, even among identical twins.
Fingerprints lock in around the 24th week of development. While these patterns of hills and valleys grow over time, their shape remains constant from birth to death, a consistency that makes them a crucial tool for law enforcement.
Beyond their use in forensics, the actual evolutionary purpose of fingerprints is far more basic: to help us grip objects. The friction provided by the three-dimensional ridges enables us to easily pick things up, and these bumpy ridges leave a lasting impression when they make contact with surfaces.
Fingerprints have fascinated people for centuries. As early as 220 BC, the ancient Chinese used fingerprints to sign legal documents, although they didn't realize the individual uniqueness of these marks at the time.
The scientific understanding of fingerprints advanced much later. In 1684, English physician Nehemiah Grew published the first scientific analysis of ridges on fingers and palms. A century later, in 1788, German anatomist Johan Meyer declared that no two people have the same fingerprints. However, it wasn't until the late 19th century that fingerprint science played a central role in criminal investigations.