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.
An early alternative method for curling hair that was suitable for use on people was invented in 1905 by German hairdresser Karl Nessler. He used a mixture of cow urine and water. The first public demonstration took place on 8 October 1905, but Nessler had been working on the idea since 1896.is method, called the spiral heat method, was only useful for long hair. The hair was wrapped in a spiral around rods connected to a machine with an electric heating device. Sodium hydroxide (caustic soda) was applied and the hair was heated to 212 Â°F (100 Â°C) or more for an extended period of time.