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Images may be two- dimensional , such as a  photograph  or screen display, or three-dimensional, such as a  statue  or  hologram . They may be captured by  optical  devices – such as  cameras ,  mirrors ,  lenses ,  telescopes ,  microscopes , etc. and natural objects and phenomena, such as the  human eye  or water. The word 'image' is also used in the broader sense of any two-dimensional figure such as a  map , a  graph , a  pie chart , or a  painting . In this wider sense, images can also be  rendered  manually, such as by  drawing , the  art of painting ,  carving , rendered automatically by  printing  or  computer graphics  technology, or  developed  by a combination of methods, especially in a  pseudo-photograph . A volatile image is one that exists only for a short period of time. This may be a reflection of an object by a mirror, a projection of a  camera obscura , or a scene displayed on a  cathode ray tube . A fixed image, also called a  hard copy , is one that h

Telephone A traditional  landline  telephone system, also known as  plain old telephone service  (POTS), commonly carries both control and audio signals on the same  twisted pair  ( C  in diagram) of insulated wires, the telephone line. The control and signaling equipment consists of three components, the ringer, the hookswitch, and a dial. The ringer, or beeper, light or other device (A7), alerts the user to incoming calls. The hookswitch signals to the central office that the user has picked up the handset to either answer a call or initiate a call. A dial, if present, is used by the subscriber to transmit a telephone number to the central office when initiating a call. Until the 1960s dials used almost exclusively the  rotary  technology, which was replaced by  dual-tone multi-frequency signaling  (DTMF) with  pushbutton telephones  (A4). A major expense of wire-line telephone service is the outside wire plant. Telephones transmit both the incoming and outgoing speech s

Water  is a transparent and nearly colorless  chemical substance  that is the main constituent of Earth's streams, lakes, and oceans, and the  fluids  of most living  organisms . Its  chemical formula  is  H 2 O , meaning that each of its  molecules  contains one  oxygen  and two  hydrogen atoms  that are connected by  covalent bonds . Strictly speaking, water refers to the liquid state of a substance that prevails at  standard ambient temperature and pressure ; but it often refers also to its solid state ( ice ) or its gaseous state ( steam  or  water vapor ). It also occurs in nature as snow,  glaciers ,  ice packs  and  icebergs , clouds,  fog ,  dew ,  aquifers , and atmospheric  humidity . Water covers 71% of the Earth's surface. [1]  It is vital for all known forms of  life . On Earth, 96.5% of the planet's crust water is found in seas and oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps of Antarctica and Greenland, a small fraction in other large

Association football Association football , more commonly known as  football  or  soccer , [a]  is a  team sport  played between two teams of eleven  players  with a spherical  ball . It is played by 250 million players in over 200 countries and dependencies, making it the world's most popular sport. [3] [4] [5] [6]  The game is played on a rectangular  field  with a  goal  at each end. The object of the game is to  score by getting the ball into the opposing goal. Players are not allowed to touch the ball with their hands or arms while it is in play, unless they are  goalkeepers  (and then only when within their  penalty area ). Other players mainly use their feet to strike or pass the ball, but may also use any part of their body except the hands and the arms. The team that scores the most goals by the end of the match wins. If the score is level at the end of the game, either a  draw  is declared or the game goes into  extra time  or a  penalty shootout  depen

Cde 5 Television  ( TV ) is a telecommunication medium used for transmitting moving images in  monochrome  ( black and white ), or in colour, and in two or  three dimensions  and sound. The term can refer to a  television set , a  television program  ("TV show"), or the medium of  television transmission . Television is a  mass medium  for entertainment,  education ,  news , politics, gossip and advertising. Television became available in crude experimental forms in the late 1920s, but it would still be several years before the new technology was marketed to consumers. After  World War II , an improved form of black-and-white TV broadcasting became popular in the United States and Britain, and television sets became commonplace in homes, businesses, and institutions. During the 1950s, television was the primary medium for influencing  public opinion . [1]  In the mid-1960s, color broadcasting was introduced in the US and most other developed countries. The availabi