One of the most wonderful discoveries made by man is radio. It is the wireless transmission of signals or sounds through free space. By all means, it is something worth using.
Many famous scientists have worked on the radio creation, including Nicola Tesla and Thomas Edison. However, the first radio receiver was introduced by Russian physicist Alexander Popov in 1895. Since its appearance, radio has been used for various purposes. Its early uses include sending telegraphic messages with the help of Morse code. It was also used during the wars for sending diplomatic and confidential messages.
Before the advent
Дарья16
04.04.2022
The poisoning of the world's land, air, and water is the fastest-spreading disease of civilisation. It probably produces fewer headlines than wars, earthquakes and floods, but it is potentially one of history's greatest dangers to human life on earth. If present trends continue for the next several decades, our planet will become uninhabitable.Overpopulation, pollution and energy consumption have created such planet-wide problems as massive deforestation, ozone depletion, acid rains and the global warming that is believed to be coused by the greenhouse effect.The seas are in danger. They are filled with poison: industrial and nuclear waste, chemical fertilisers and pesticides. The Mediterranean is already nearly dead; the North Sea is following. The Aral Sea is on the brink of extinction. If nothing is done about it, one day nothing will be able to live in the seas.Every ten minutes one kind of enimal, plant or insect dies out for ever. If nothing is done about it, one million species that are alive today will have become extinct twenty years from now.Air pollution is a very serious problem. In Cairo just breathing the air is life threatening- equivalent to smoking two packs of cigarettes a day. The same holds true for Mexico City and 600 cities of the former Soviet Union.Industrial enterprises emit tons of harmful substunces. These emissions have disastrous consequences for our planet. They are the main reason for the greenhouse effect and acid rains. An even greater environmental threat are nuclear power stations. We all know how tragic the consequences of the Chernobyl disaster are.People are beginning to realise that environmental problems are not somebody else's. They join and support various international organosation and green parties. If governments wake up to what is happening- perhaps we'll be able to avoid the disaster that threatens the natural world and all of us with it.
gorsimonyan4
04.04.2022
Christmas in England The English enjoy beautiful Christmas music. They love to decorate Christmas Trees and hang up evergreen branches.
One England's customs is mummering. In the Middle Ages, people called mummers put on masks and acted out Christmas plays. These plays are still performed in towns and villages.
The English gift giver is called Father Christmas. He wears a long red or green robe, and leaves presents in stockings on Christmas Eve. However, the gifts are not usually opened until the following afternoon.
Christmas in England began in AD 596, when St Augustine landed on her shores with monks who wanted to bring Christianity to the Anglo Saxons.
Father Christmas delivers them during the night before Christmas. The Children leave an empty stocking or pillowcase hanging at the end of the bed. In the morning they hope it will be full of presents.
In England the day after Christmas is called Boxing Day because boys used to go round collecting money in clay boxes. When the boxes were full, they broke them open.
In England Christmas dinner was usually eaten at Midday on December 25, during daylight.
In England, the only thing that people ate on the day before the feast was Frumenty, which is, was a kind of porridge made from corn. Over the years the recipe changed. Eggs, fruit, spice, lumps of meat and dried plums were added. The whole mixture was wrapped in a cloth and boiled. This is how plum pudding began.
In England the traditional Christmas dinner is roast turkey with vegetables and sauces. For dessert it is rich, fruity Christmas pudding with brandy sauce. Mince pies, pastry cases filled with a mixture of chopped dried fruit.
In England also they elect Boy Bishops in commemoration of St. Nicholas compassion for children. These mock bishops were allowed to do the duties of the ecclesiastic except deliver the Mass.
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Many famous scientists have worked on the radio creation, including Nicola Tesla and Thomas Edison. However, the first radio receiver was introduced by Russian physicist Alexander Popov in 1895. Since its appearance, radio has been used for various purposes. Its early uses include sending telegraphic messages with the help of Morse code. It was also used during the wars for sending diplomatic and confidential messages.
Before the advent