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 test page published and promoted by the Web Standards Project
to expose web page rendering
flaws in web browsers
and other applications that render HTML
. It was developed in the spirit of Acid1
, a relatively narrow test of compliance with the Cascading Style Sheets
1.0 (CSS1) standard
, and was released on April 13, 2005. Like Acid1, an application passes the test if the way it displays the test page matches a reference image. Acid2 tests aspects of HTML markup, CSS 2.1 styling, PNG
images, and data URIs
. The Acid2 test page will be displayed correctly in any application that follows the World Wide Web Consortium
and Internet Engineering Task Force
specifications for these technologies. These specifications are known as web standards
because they describe how technologies used on the web are expected to function. While at the time of Acid2's release no web browser passed the test, Acid2 was designed with Microsoft Internet Explorer
particularly in mind. The creators of Acid2 were dismayed that Internet Explorer did not follow web standards and, consequently, Internet Explorer was prone to display web pages differently from other browsers. Acid2 represented a challenge to Microsoft to bring Internet Explorer in line with web standards, making it easier to design web pages that work as intended in any web browser.
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Did you know...
was a French aeronaut
. The widow of ballooning
pioneer Jean-Pierre Blanchard
, she was the first woman to work as a professional balloonist. Though nervous on the ground, she was a fearless aeronaut and after her husband's death she continued ballooning, making more than 60 ascents. Known throughout Europe for her ballooning exploits, she entertained Napoleon Bonaparte
, who promoted her to the role of "Aeronaut of the Official Festivals", replacing André-Jacques Garnerin
. On the restoration
of the monarchy in 1814 she performed for Louis XVIII
, who named her "Official Aeronaut of the Restoration". Ballooning was a risky business for the pioneers. Blanchard lost consciousness on a couple of occasions, endured freezing temperatures and almost drowned when her balloon crashed in a marsh. In 1819 she became the first woman to be killed in an aviation accident
when, during an exhibition in the Tivoli Gardens in Paris, she launched fireworks that ignited the gas in her balloon. Her craft crashed on the roof of a house and she fell to her death.
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