Telescope Powerful telescopes are used to observe the space. Presence of stars, not visible even through powerful optical telescopes, is determined by even more sophisticated telescopes like radio telescopes etc. These telescopes can detect radio waves, U.V. rays and X-ray signals which are emitted by distant stars and other celestial bodies. These days probes or unmanned satellites, remote sensing satellites etc. can record the photographic images of these celestial bodies.  

Fax Machine The system of coding and decoding of the data is the same in all the fax machines so that a message sent from one part of the world can be received at the other part of the world. When the signals (incoming) sent from a fax machine reach the telephone receiver of an-other fax machine, they are separated from the carrier wave and fed into the printer.  The electrical...

 Net vs Web The Internet or simply Net is a large-scale computer network spanning the whole world. Actually, it is a network of computer networks where, a computer network is an interconnection of two or more autonomous computers. The Web which is also referred to as the World Wide Web (WWW) is the set of services available on the Internet which allow the users at one place of the world to...

Computers used today Today, computers have wriggled their way almost everywhere and are used extensively. They are used for carrying business transactions, billing, inventory, letters, pay-roll etc.; in banks to maintain the record of customers account and transfer of money from one bank to another; in rail-ways for getting reservations done; in hospitals to keep a record of the patient’s personal files: in schools for teaching computers; in advertising: in entertainment...

How did the Omnibus get its name? We usually call a motor vehicle that carries passengers a bus, but this word is short for the Latin word omnibus. Why should such a strange word find its way into the English language? In fact, it did not first enter English at all, but French, because bus services originated in France. In 1823, a horse-drawn bus service opened in Nantes. The terminus was...

When was the armoured tank first used? The tank first came into use in 1916 during World War I. The British developed this fighting vehicle to try and break the deadlock that had occurred between the two sides fighting in France. Neither foot soldiers nor cavalry could survive the murderous rain of bullets that marked any action, but a heavy armoured vehicle armed with powerful guns and moving on caterpillar tracks...

What is Eastern music like? Eastern music is completely different from the classical and popular music of Europe and America. It uses notes in another way, and the instruments are unlike those of the West. Another big difference is that most Eastern music is not written down, but made up as the player performs the music. Most Western music is written down and is played exactly the same way every time...

What does ballet dancing portray?   In ballet, the movements of the dancers interpret the sound of the music. Often a ballet has a story, and the dancers act out the story. Instead of words, they use their bodies and move their hands and faces to portray actions and feelings. The ballet may be set to music that already exists, but sometimes the music is written especially for the ballet. It...