Tag: science & technology

Textiles are highly absorbent materials. When fingers contact fabric, the natural oils and moisture that create latent prints are rapidly absorbed into the fibers, causing the print to spread and become indistinct rather than remaining on the surface.

Finger ridges evolved to enhance friction and grip. They function like tire treads, helping us grasp objects securely by increasing surface area and providing mechanical advantage. The other functions listed are incidental benefits, not the primary evolutionary purpose.

Fingerprints are left behind due to natural secretions on our skin. Sweat glands produce moisture, and sebaceous glands produce oils. When we touch objects, these substances transfer to the surface, creating the impression that constitutes a fingerprint.

Fingerprints begin forming during fetal development. By approximately three months of gestation, the basic ridge patterns are established and remain unchanged throughout life, only growing in size as the individual grows.

Koalas have fingerprints that are remarkably similar to human fingerprints, with similar ridge patterns and minutiae characteristics. This evolutionary convergence is so striking that koala fingerprints can be confused with human prints even by experts.

The first criminal conviction based on fingerprint evidence occurred in Argentina in 1892. The case involved the murder of two children, and police officer Juan Vucetich used fingerprint evidence to identify Francisca Rojas as the perpetrator.

In 1902, Henry Jackson became the first person in the UK convicted based on fingerprint evidence. He was found guilty of burglary after his fingerprints were discovered on a windowsill at the scene of a break-in.

J. Edgar Hoover, as FBI Director, established the first national fingerprint register in the 1920s under his leadership of the FBI. August Vollmer was a pioneer in criminalistics but worked at the local level, not national. The fingerprint database became a cornerstone of modern criminal identification.

Mark Twain featured fingerprint evidence in his 1882 story 'The Stolen White Elephant,' preceding Conan Doyle's Sherlock Holmes works. While Conan Doyle made fingerprinting famous through Holmes, Twain was actually the first to use it in fiction. Agatha Christie and Kipling came later.

Thomas Jennings was convicted of murder in 1910 based on fingerprint evidence, marking the first time fingerprint evidence was used to secure a conviction in the USA. His fingerprints were found at the crime scene (the home of Clarence B. Hiller, who had been murdered during a burglary). This case established the legal admissibility and credibility of fingerprint evidence in American courts. The other options (bootlegging, forgery, kidnapping) are unrelated to this landmark case.