Technology is the practical use of science, including the making, modification or improvement, applied activity or behavior, use and knowledge of tools, machines, techniques, crafts, systems, methods of organization, or environmental modifications or arrangement in order to solve a problem, improve a preexisting solution to a problem, achieve a goal or perform a specific function. It can also refer to the collection of such tools, machinery, modifications, environmental arrangement and procedures. Technologies significantly affect human as well as other animal species' ability to control and adapt to their natural environments. The word technology comes from Greek τεχνολογία (technología); from τέχνη (téchnē), meaning 'art, skill, craft', and -λογία (-logía), meaning 'study of-'. The term can be applied either generally or to many specific areas, examples of which include construction technology, medical technology and information technology.
The human species' use of technology began with the conversion of natural resources into simple tools. The prehistorical discovery of the ability to control fire increased the available sources of food and the invention of the wheel helped humans in travelling in and controlling their environment. Recent technological developments, including the printing press, the telephone, and the Internet, have lessened physical barriers to communication and allowed humans to interact freely on a global scale. However, not all technology has been used for peaceful purposes; the development of weapons of ever-increasing destructive power has progressed throughout history, from clubs to nuclear weapons.
Technology has affected society and its surroundings in a number of ways. In many societies, technology has helped develop more advanced economies (including today's global economy) and has allowed the rise of a leisure class. Many technological processes produce unwanted by-products, known as pollution, and deplete natural resources, to the detriment of the Earth and its environment. Various implementations of technology influence the values of a society and new technology often raises new ethical questions. Examples include the rise of the notion of efficiency in terms of human productivity, a term originally applied only to machines, and the challenge of traditional norms.
Philosophical debates have arisen over the present and future use of technology in society, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar movements criticise the pervasiveness of technology in the modern world, opining that it harms the environment and alienates people; proponents of ideologies such as transhumanism and techno-progressivism view continued technological progress as beneficial to society and the human condition. Indeed, until recently, it was believed that the development of technology was restricted only to human beings, but recent scientific studies indicate that other primates and certain dolphin communities have developed simple tools and learned to pass their knowledge to other generations.
) is a manufacturing
process for producing parts by injecting material into a mold. Injection molding can be performed with a host of materials, including metals, glasses
, confections, and most commonly thermoplastic
polymers. Material for the part is fed into a heated barrel, mixed, and forced into a mold cavity where it cools and hardens to the configuration of the cavity. After a product is designed, usually by an industrial designer
or an engineer
, molds are made by a moldmaker
(or toolmaker) from metal, usually either steel
, and precision-machined
to form the features of the desired part. Injection molding is widely used for manufacturing a variety of parts, from the smallest component to entire body panels
. Parts to be injection molded must be very carefully designed to facilitate the molding process; the material used for the part, the desired shape and features of the part, the material of the mold, and the properties of the molding machine must all be taken into account. The versatility of injection molding is facilitated by this breadth of design considerations and possibilities.
was a German Lutheran mathematician
, and a key figure in the 17th century astronomical revolution. He is best known for his eponymous laws of planetary motion
, codified by later astronomers based on his works Astronomia nova
, Harmonices Mundi
, and Epitome of Copernican Astronomy
. Before Kepler, planets' paths were computed by combinations of the circular motions of the celestial orbs
. After Kepler, astronomers shifted their attention from orbs
—paths that could be represented mathematically as an ellipse
. Kepler's laws also provided one of the foundations for Isaac Newton
's theory of universal gravitation
. During his career Kepler was a mathematics teacher at a Graz
seminary school, an assistant to Tycho Brahe
, the court mathematician to Emperor Rudolf II
, a mathematics teacher in Linz
, and an adviser to General Wallenstein
. He also did fundamental work in the field of optics
and helped to legitimize the telescopic discoveries of his contemporary Galileo Galilei
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