the fist of the sender

Fingernail storage is a method of writing data onto a human fingernail using a pulsed laser. The fluorescence of the nail, when exposed to ultraviolet ight, is increased at points where data is written. Data can be read from the fingernail using a microscope while irradiating the nail with UV energy. Fingernail storage has been suggested as a biometric means of identification, and also for storing critical medical information for use in emergencies. It can also be used as an unintrusive means for automatically recognizing the identity of individuals for instance keystroke dynamics. The patterns of rhythm and timing created when a person types. The roots of keystroke dynamics go back to the early days of the telegraph, when individuals developed distinctive patterns that identified them. This pattern was known as the fist of the sender

A nail is a horn-like envelope covering the tips of the fingers and toes in humans, most non-human primates, and a few other mammals. Nails are similar to claws in other animals. Fingernails and toenails are made of a tough protective protein called keratin. This protein is also found in the hooves and horns of different animals. Each nail consists of several parts, including: Lunula, Free edge, Nail Root , Perionychium, Hyponychium and Cuticle,

A healthy finger nail has the function of protecting the distal phalanx, the fingertip, and the surrounding soft tissues from injuries. It also serves to enhance precise delicate movements of the distal digits through counter-pressure exerted on the pulp of the finger. The nail then acts as a counterforce when the end of the finger touches an object, thereby enhancing the sensitivity of the fingertip, even though there are no nerve endings in the nail itself. The nail also functions as a tool, enabling an extended precision grip pulling out a splinter in one’s finger and certain cutting & scraping actions or eating with fingernails

stockphoto 2016