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Wednesday, July 30, 2008

Why can’t babies walk at birth as some animals do?

From the moment of birth a baby can carry out all natural functions, just like any animal’s offspring. However, unlike other species, a human baby cannot walk straight away. This is party because man walks on two legs whereas animals walk on four legs. So it is more different for babies to learn to walk and they have to crawl on all fours first. Man also has a longer life than most animals and he takes longer to grow into an adult. Therefore, the baby stage lasts longer.
Another point is that offspring of animals often have to start looking after themselves when they are very young, so they need to be able to walk as early as possible.

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Why do we have to pay taxes?

A tax is a sum of money which is paid by the citizens of a country to its government. Some taxes are direct, such as those you pay when you own certain things like a house or a car: others are added on to things you buy like electrical goods, and petrol, or services such as repairs, building work, and restaurant meals. The government then claims the money back from the shops and service operators.
Taxes are the main income of the government and it uses this money to pay for public services such as roads, health, schools, police and national defense. In democratic countries, people usually pay more or less tax according to how much they earn.

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Friday, July 25, 2008

FASCINATING FACTS

Who knows what?
The average woman’s brain weighs around 4 oz lighter than a man’s. The Brain of Neanderthal man was bigger than both.

Super tankers
The rudder of a giant oil tanker could provide parking space for nearly fifty cars if laid on its side.

Windy
Workers on Japanese building sites sometimes use kites to carry bricks up tall buildings.

Slow risers
Some species of snail have been known to sleep continuously for four years.

Bare-faced Piggery
At the turn of the century, a shaved bear dressed in female clothing was exhibited as ‘The Pig – Woman’, a fortune – teller whose grunted replies were prompted by a man beneath the table with a sharp stick.

Wet lot
The average American uses sixty gallons of water every day.

Passing fancy
Inmates who escaped from Sing. Sing prison could rely on change of clothes at the home of millionaire Whitelaw Reid, who kept two suits hanging in an outside barn for that purpose.

Strict Upbringing
Young men in Malagasy Indian tribes must pay their fathers for the right to grow taller than them. While their fathers are alive they cannot shave or eat animal rumps.

Peace on earth
Just under three quarters of the earth’s population live without radio, television, newspapers or telephones.

Museum Piece
A coin described as a ‘Roman sesterce coin from between 135 and 138A.D. was removed from display when a nine-year-old boy recognized it as a plastic medallion given with bottles of Pop.

Hello, XLZPTZ Speaking
There is enough telephone cable under New York to reach Venus.

Cheeky Monkey
An art student in Pretoria who submitted a chimpanzee’s picture instead of his own was awarded a pass mark by examiners.

Larger than life
Western sets in old Holly wood movies were built smaller than in real life to make the cowboys look big.

Vintage stuff
The word vinegar comes from the French VIN aigre, meaning sour wine.

Not cats and Dogs
During a freak storm in France, thousand of small toads rained down on the startled population.

Thick-Skinned
Although toads are capable of surviving 10,000 mg. of fluoracetic acid, as little as 1 mg. will kill a dog.

Spider Dressing
High-Class barbers in Roman time used to dress the cuts of their clients spiders’ webs soaked in vinegar.

Early Start
Female children in the Tiwi Islands in the Pacific are engaged they are born. They are married at birth to the adult of their parents’ choice.

Deep freeze
A Lizard discovered inside a block of a ice buried 33 ft. below ground level in Siberia, was found to be alive.

Going up
The three astronauts who spent twelve weeks in space on the sky lab mission had grown two inches taller by the time they returned to Earth.

Sweet teeth
One third of the world’s boiled sweets are eaten in Britain.

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Saturday, July 19, 2008

Why do some Plugs spark when disconnected?

The electricity supplied to a building travels round a circuit in cables under the floor and back to the main supply point. A Plug socket is a point where there is a deliberate break or gap in that circuit. When you plug something in, the circuit is complete, and the electric current passes through the apparatus, making it work.
If you pull the plug out when the current is switched on, the contact surface of the plug pins gets smaller as it is pulled out. The ends of the pins heat up very quickly and then the remaining electricity in them jumps across the gap between the pins, which we see as a spark. You should always switch off a plug before disconnecting it.

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Friday, July 18, 2008

Why do you put water in Car Radiators?

When Petrol is burnt in a car engine it gives off a lot of heat, which affects the various parts of the engines. Although the heat only rises slowly it could cause the engine to seize up. So these parts have to be cooled by water which circulate around the engine is special channel.
The water first passes through the radiator which is made up of lots of thin pipes, kept cool by the air which blows against them as the vehicle is moving. The cooling action is also helped by a fan turned by the engine. This water is carried around the rest of the engine to cool it down. Heat is transferred to the water which returns to the radiator and is cooled again.

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Thursday, July 17, 2008

How do Telephones work?


The way that Telephones work is similar in some ways to television, but the transmission uses an electric current rather than air waves, and telephones transmit only sound, not pictures.

When you speak on the Telephone, the microphone inside the mouthpiece transforms the sound waves into electrical impulses. These are transmitted through the telephone cable to the ear piece of the other person’s receiver. This turns the impulses into sounds which are nearly identical to those made by the caller, so that it is like listening to the actual voice of the person talking.

Years ago, and still today in some isolated places, you had to ask the operator or at the telephone exchange to connect your telephone with someone else’s in order to speak to them. Nowadays, thanks to the progress of electronics, the connection is made automatically, even to countries on the other side of the world.

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Sunday, July 13, 2008

How an Electronic Calculator Works?

The operations of an electronic calculator are not only very quick, they are also very basic. Most of the calculations are done using simple addition and subtraction, and a number system which has only two numbers, 0 and 1.
This binary (two-state) number system is used in calculators and other electronic devices, because they operate on a system of electronic switches, which at any time can only be in one of two states; off or on. In the Binary code, ‘off is represented by 0, and ‘on’ by 1.
The calculator keyboard uses our usual (decimal) numbers, from 0 up to 9, on its keys, but when a key is pushed down, the calculator understands this in the binary equivalent, which is fed through a ‘switch point’ situated under the key, and from there into the heart of the calculator – the ‘chip’.
This is a tiny integrated circuit, an incredible network of electronic components in a piece of Silicon, itself smaller than a Do stage stamp.
The chip carries out the binary operations at the speed of light, and its answers are sent back to the display, and its answers are sent back to the display. The Calculator converts binary into decimal again, using a ‘decoder’ (a circuit based on switches),and these decimals appear on the display panel, using LED, or light emitting diode, segments.
The space for each unit on the display has seven such segments, plus a decimal point, and each LED gives off a reddish glow when required. Different combinations of these segments light up any decimal number from 0 up to 9, as the chip instructs through the switching circuit.
The chip adds in the standard binary way: 0+1 = 1; 0+) = 0’ and 1=1 = 0 (equivalent of 2). And it subtracts by reversing this procedure.
The operations of multiplication and division are carried out by continued addition and subtraction, respectively. For example, to multiply 43 by 17, the calculator adds 43 seventeen times. This may seem show to us, but electronically the answer is arrived at almost immediately.
Just try dividing 1,089 by 33, and see how long you take! How would the calculator solve this one? And because it works electronically, it can do harder sums in about the same amount of time. It would divide 582.31 by 34.9 as soon as add two and two!

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Friday, July 11, 2008

Which language is spoken by most people?

Over 500 million people speak one of the Mandarin Chinese dialects. Chinese is unlike most other languages as it has no alphabet, but uses instead several thousand characters or symbols, each of which conveys one complete idea. Each character has only one syllable, and most words are made up of two or more characters. A character can change its meaning by the way its pronounced or by changing its position in a sentence, It is only in the last hundred years that ways have been invented to write Chinese in the Roman alphabet.

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Wednesday, July 2, 2008

Why is playing important?

Some adults think that when children play they are wasting their time and that it is more important to study. They couldn’t be more wrong. Children need to play both by themselves and with others as they develop their personalities this way. Babies, especially, learn through playing, and children’s games change as they grow up, until they reach an age where they are gradually replaced by other activities and pastimes. Adults do not play in the same way as children, but they also need leisure interests – more than ever now that working hours are less – both to amuse themselves and to relax.

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