Ani (Armenian: Անի) is a ruined and uninhabited medieval Armenian city-site situated in the Turkish province of Kars, near the border with Armenia. It was once the capital of a medieval Armenian kingdom that covered much of present day Armenia and eastern Turkey. The city is located on a triangular site, visually dramatic and naturally defensive, protected on its eastern side by the ravine of the Akhurian River and on its western side by the Bostanlar or Tzaghkotzadzor valley. The Akhurian is a branch of the Araks River and forms part of the current border between Turkey and Armenia. Called the "City of 1001 Churches", Ani stood on various trade routes and its many religious buildings, palaces, and fortifications were amongst the most technically and artistically advanced structures in the world.

At its height, Ani had a population of 100,000–200,000 people and was the rival of Constantinople, Baghdad and Cairo. Long ago renowned for its splendor and magnificence, Ani has been abandoned and largely forgotten for centuries.

A simple machine is a mechanical device that changes the direction or magnitude of a force. In general, they can be defined as the simplest mechanisms that provide mechanical advantage (also called leverage).

Usually the term refers to the six classical simple machines which were defined by Renaissance scientists:

A simple machine is an elementary device that has a specific movement (often called a mechanism), which can be combined with other devices and movements to form a machine. Thus simple machines are considered to be the "building blocks" of more complicated machines. This analytical view of machines as decomposable into simple machines first arose in the Renaissance as a neoclassical amplification of ancient Greek texts on technology, and is still a central part of engineering in today's age of applied science. For example, wheels, levers, and pulleys are all used in the mechanism of a bicycle. Between the simple machines and complex assemblies, several intermediate classes can be defined, which may be termed "compound machines" or "machine elements". The mechanical advantage of a compound machine is simply the product of the mechanical advantages of the simple machines of which it is composed.