S CREATIVE WRITER

Bicycle Bicycles are vehicles with two wheels, a handlebar, and a seat. They do not have an engine and are propelled by foot pedals. They are the principal mode of transportation in many countries. Cycling is also a popular form of sport and leisure activity. Bicycles vary in shape, size, and use. They are used by people for many different purposes including recreation, exercise, and transportation. They are common throughout the world and especially in Chino, lndia,Brazil,ltoly, South Korea, Japan, Taiwan, and the United States. Cycling is also an Olympic sport. Early attempts Many attempts were made to invent the bicycle. The bicycle was not invented by one single person. In 1490, Leonardo Da Vinci made the first known drawing of a bicycle. Jean Teson invented a bicycle like vehicle in 1645 in France. It resembled a bicycle but was a four-wheeled machine. It had no brakes, pedals, or steering mechanism and needed foot movement. Celerifere Comte Mede de Sivrac, a F...

Microwaves Microwaves are electromagnetic radiations. They are used for generating heat and are also used for communications. Longer microwaves like those used in a microwave oven are used to cook food. Shorter microwaves are used in communication and weather forecasts. Microwaves, which are used for radars, are just a few centimetres long. Short and long microwaves Each wave has a certain shape and length .The distance between peaks or high points is called wavelength. Microwaves are of two basic types depending on their wavelengths-short and long microwaves. Short microwaves have short wavelengths that can be measured in centimetres, while the long microwaves have wavelengths of about a foot. Discovery The existence of microwaves was predicted by a Scottish scientist, James Clerk Maxwell, in 1864. His equations predicted the existence of microwaves. Twenty-four years later, in 1888, Heinrich Hertz demonstrated that Maxwell was right about the existence of microwa...

Television A Television is a device that electronically transmits moving pictures and sounds over a distance. It is one of the most important means of communication. The word ‘television’ means ‘far sight’. It is. derived from the Greek word tele which means ‘far’ and a Latin word vision which means ‘sight’. Televisions bring pictures and sounds to homes from around the world. These images are relayed by communication satellites in the form of radio waves. Television sets have aerials that receive the waves and change them into moving pictures and sounds. Web TV Web TV technology was invented in 1996. The first web TV sets were produced by Diba Inc. and Zenith Electronics. Web TV is commonly used to access the Internet through television sets. It provides a set top box that connects to the television and the telephone line. The web TV network was bought by Microsoft in 1997. Vladimir Kosmich Zworykin Vladimir Kosmich was a Russian-American inventor. He was a pione...