A steam turbine
with the case opened. Such turbines produce most of the electricity used today. Electricity consumption and living standards are highly correlated. Electrification is believed to be the most important engineering achievement of the 20th century.
Technology ("science of craft", from Greek τέχνη, techne, "art, skill, cunning of hand"; and -λογία, -logia) is the collection of techniques, skills, methods, and processes used in the production of goods or services or in the accomplishment of objectives, such as scientific investigation. Technology can be the knowledge of techniques, processes, and the like, or it can be embedded in machines to allow for operation without detailed knowledge of their workings.
The simplest form of technology is the development and use of basic tools. The prehistoric discovery of how to control fire and the later Neolithic Revolution increased the available sources of food, and the invention of the wheel helped humans to travel in and control their environment. Developments in historic times, 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.
Technology has many effects. It 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 Earth's environment. Innovations have always influenced the values of a society and raised new questions of the ethics of technology. Examples include the rise of the notion of efficiency in terms of human productivity, and the challenges of bioethics.
Philosophical debates have arisen over the use of technology, with disagreements over whether technology improves the human condition or worsens it. Neo-Luddism, anarcho-primitivism, and similar reactionary movements criticize the pervasiveness of technology, arguing 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.
An air well
or aerial well
is a structure or device that collects water by promoting the condensation
from air. Designs for air wells are many and varied, but the simplest designs are completely passive, require no external energy source and have few, if any, moving parts. Three principal designs are used for air wells: high mass, radiative and active. High-mass air wells were used in the early 20th century, but the approach failed. From the late 20th century onwards, low-mass, radiative collectors proved to be much more successful. Active collectors collect water in the same way as a dehumidifier
; although the designs work well, they require an energy source, making them uneconomical except in special circumstances.
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Did you know...
(1809–77) was an English architect, architectural historian
, railway engineer, and sanitary
reformer. Sharpe's main focus was on churches, and he was a pioneer in the use of terracotta
as a structural material in church building, designing what were known as "pot" churches. He also designed secular buildings, including domestic properties and schools, and worked on the development of railways in Northwest England, designing bridges and planning new lines. In 1851 he resigned from his architectural practice, and in 1856 he moved from Lancaster, spending the remainder of his career mainly as a railway engineer. Sharpe was involved in Lancaster's civic affairs. He was an elected town councillor and served as mayor in 1848–49. Concerned about the town's poor water supply and sanitation, he championed the construction of new sewers and a waterworks. Sharpe achieved national recognition as an architectural historian. He published books of detailed architectural drawings, wrote a number of articles on architecture, devised a scheme for the classification of English Gothic architectural
styles, and in 1875 was awarded the Royal Gold Medal
of the Royal Institute of British Architects
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