The earliest example of equine footwear we have is made of animal hide and dates from about 600 B.C. This primitive hoof protector looks more like a horse bootie than what we think of today as a horseshoe. It was probably stuffed with dried grass or other available natural material and tied on with hide thongs.
The spiral model is a software development process combining elements of both design and prototyping-in-stages, in an effort to combine advantages of top-down and bottom-up concepts. The spiral model was defined by Barry Boehm in his article A Spiral Model of Software Development and Enhancement from 1985. This model was not the first model to discuss iterative development, but it was the first model to explain why the iteration matters.
The first method, called the Palmer method, was invented in the early 1900âs as an alternative form to the very artistic and difficult to read cursive that had developed in the 19th century. By 1920, the Palmer method was the primary form of cursive that was being taught in schools. About 50 years later, Donald Thurber created a new method of cursive than involved connecting printed letters with tails.