What is Internet TV?

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Internet TV is an Internet service for home TV use. Using a set-top box it connects the TV to a modem and telephone line. Rather than using a computer monitor for viewing, the user interface has been specialized in a way that interlaced TV screen can be used for viewing. WebTV was the first such service to obtain widespread distribution.

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When were the First Mechanical Clocks Made?

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The first mechanical clocks are believed to have been made in China in 1088 AD. Later in 1200s, they were first made in Europe. Such clocks made in Europe were driven by a weight on the end of a cord wound round a drum. As the drum rotated, it turned the hands of the clock. The earliest known clock was made in Spain in 1276 AD and the oldest mechanical clock that still works is in Salisbury cathedral in Britain. It was made in 1368. These clocks had devices called escapements to keep the hands turning at the correct rate, so that the clocks depicted the correct time.
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When was Radar Invented?

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Radar was invented during 1930s. Many countries worked on radar at this time, but the first successful radar was built by Britain in 1935. Radar works by sending out radio signals that bounce off distant objects. The radar set detects the signals that return and produces a picture indicating the position of the objects . British and American scientists worked together to invent methods of using short waves called microwaves.
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Where are Diamonds Found?

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Diamonds are crystals and are the hardest naturally occurring substance in the world. They are formed by intense heat and pressure, deep beneath the surface of the Earth. They are made up of pure carbon and are usually colourless. Diamonds have to be cut in a special way to catch the light and sparkle. Diamonds have been formed millions of years ago from carbon which was caught up in molten rock deep in the Earth's crust. South Africa, Tanzania and Siberia have been mined for diamonds. Diamonds also come from the gravels of rivers in some areas in Africa , India, Indonesia, Brazil, Australia and Russia . 
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What are Deciduous Trees?

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T he deciduous trees are the ones that lose their leaves in autumn. These trees are largely the broad-leaved trees of the northern hemisphere. Winter in this region is very harsh, so the trees shed their leaves in autumn to spend the winter in a state of dormancy . They do so to conserve water, by avoiding transpiration through leaves. There is frost all around and the roots get no water from the soil. Maples , magnolias, oaks, beech are some deciduous trees.
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