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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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What is a Geostationary Orbit?

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Artificial satellites sent from the Earth orbit around the earth. The ones near the Earth orbit faster than the ones far away. A satellite 35,900 Km above the Earth's surface, takes 24 hours to orbit once. The satellite is always above the same point on the Earth's surface as the planet rotates. Geostationary orbit is also called as geosynchronous ' orbit. Such satellites are used to receive telephone and television signals and retransmit them over long distances.
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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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What is a Microchip?

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The modern compact computers would be impossible without the miniaturization of electronic components called microchip. A microchip is an integrated circuit constructed on a single piece of silicon. The silicon chip is sealed inside a black plastic block with metal contacts along its sides for connecting it to a printed circuit board. There are different types of microchips for different jobs, like the memory chips to store computer data. Microchips are able to perform at almost the speed of light more than a million operations per second.
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