What is a Hardware?

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Hardware is the physical part of a computer system that enables us to operate it. It includes keyboard, screen, disk drives and electronic circuits. The first electronic computer which was built in 1945, weighed 30 tonnes and occupied a space of 140 sq metres. It contained more than 18,000 valves. Modern computers are compact and powerful and fit on a desktop.

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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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How Big is the Earth?

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The distance around the Earth, that is, it's circumference around the equator is 40,091 kilometres. The diameter (the distance across the centre of the Earth ) at the equator is 12,756 kilometres. The Earth is slightly smaller when measured between the poles (12,713 kilometres), so it is not an exact sphere. If the Earth is weighted on a weighing machine, it would be nearly 6x10 tonnes.
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When did Giant Mammals Live on the Earth?

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T he largest land mammal of all time was the giant hornless rhinoceros Indricotherium , which lived in the Oligocene epoch. It stood 5.5 metres high at the shoulder and its head would bypass a modern giraffe. Brontotheres stood at 2.5 metres at the shoulder. The horse like animal Moropus was a little smaller. All these animals browsed in the open plains.
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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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Black Panther

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Africa and Asia, black panthers are black-coated leopards, and in North, Central, and South America, they're dark-coated jaguars. In other words, “black panther” is an umbrella term used to refer to any leopard or jaguar with an unusually dark coat. Black panthers are not specific species, but refer to the blackened individuals of several panthers. Cats, especially large species, usually find some black individuals with different colors from the original ones. Leopards with normal coat color can produce the same litter cubs with black coat and normal coat color. Descendants who give birth to normal coat colors have less impact on survival than albinism, so melanism is more common than albinism, and species living in rain forests or bushes may even be more conducive to survival due to melanism. Under the bright light, the blackened leopard can find that the body hair is not pure black, but dark brown with different shades, and it can still recognize the unique markings of various le...
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