Why? on Pitara Kids Network

Why's the Sun Red during Sunrise and Sunset?

Sat, 01 Feb 2003 14:19:47 +0000

As day breaks, a reddish-white ball of light that we call the sun, rises. This red haze gives way to a golden-white sheen as the day advances and reappears when the sun sets in the evening. Does the sun really change colours, or does it only seem so? The explanation lies in-between.

Light from the sun consists of three kinds of radiation – ultra-violet rays, visible light and infra-red rays. Unlike visible light, ultra-violet rays and infra-red rays cannot be seen.

Why do Plants Lean Toward Sunlight?

Fri, 31 Aug 2001 21:39:58 +0000

Plants kept inside a room always grow in the direction of the window. In woodlands where there is a thick canopy of trees and sunlight rarely falls on earth, very few plants survive. Those that do, do not require sunlight to make their food.

People have long wondered about this phenomenon until the answer was discovered and explained by the English naturalist Charles Darwin. He demonstrated that the growing shoot of a grass seedling always bends towards light. This is due to a phenomenon called phototropism.

Why don't Birds on a wire get a shock?

Tue, 29 Aug 2006 16:28:41 +0000

Now how is that possible? The fact is, for a living creature to get a ‘shock’ there has to be a substantial flow of current through the body. However, there is barely any current running through the bird’s body for two reasons. Firstly, the bird not only forms a circuit with the wire, but it also offers a high resistance to current, so the current passes through the wire instead of the bird.

It’s a bit like this, would you prefer going on a smooth road or a road full of potholes? The answer is obvious and just like you, the current prefers taking the easier path. All objects offer some amount of resistance to the flow of current, depending on the material.

Why does water stay cool in earthen clay pots?

Fri, 21 Feb 2003 13:54:47 +0000

Have you ever had a drink of cool refreshing water from a ‘matka’ or earthen clay pot placed outside? Surprisingly enough, the pots are exposed to blazing sunlight, yet the water within stays so cool. How is that possible?

This is because of a physical process known as evaporation. When a liquid changes to a gaseous (or vapour) state without boiling, it is known as evaporation.

A matka is made of mud and has many minute pores (extremely small holes). No matter how tightly you pack the mud, these pores remain. It is through these pores that the water, placed inside the matka, oozes out. Now, to evaporate, the water needs to absorb heat, which will change it to vapour.

Why do Ants walk in a Line?

Thu, 07 Mar 2002 00:40:25 +0000

When I woke up one summer morning, I noticed a string of dashes on my bedroom wall. The line ran from the ceiling to the wall behind my bed and then disappeared under it.

As I watched, I saw one of the dashes move. It was a small red ant walking up the line. Soon, another one followed and then another, till it grew into an army of ants marching up the wall.

I noticed that while walking in a line the ants were cleaning the wall paint underneath them and, in the process, making a path. And there is a very good reason for them walking in a line.

Why do Clocks Run Clockwise?

Sat, 23 Dec 2006 21:09:41 +0000

“Time to get dressed!” cries a harried Mama as she tries to pack the bag, straighten the tie, pack lunch, tie shoelaces as at the same time she pushes children dragging their heels towards the bus stop. Oh? Is it already “Time for school?” later still its “time for dinner” or “time for bed!” Old Father Time can be quite an interfering busybody and there really is nothing we can do. Most of us spend a greater part of our time and lives trying to beat exactly this – time!

Why can’t the Sun melt Snow?

Mon, 10 Feb 2003 13:20:47 +0000

There are some things in nature that have a great capacity to toss back or reflect a great deal of the sun’s light that falls on them. One of them is snow. Newly formed snow reflects about 90 per cent of the sunlight that falls upon it. This means that the sun is powerless to melt clean snow. And when snow does melt, it is not because of the sunlight. Snow does not melt on a spring day because of the sun’s heat. It melts because of the warm air from the sea.

Why Do We Have Wrinkly Fingers After Swimming?

Sat, 26 Mar 2005 10:05:37 +0000

You’ve been playing in the pool for almost an hour now, practicing your best underwater somersaults. Now it’s time to get out, and as you look at your hands, it’s . . . it’s . . . it’s the attack of the wrinkly fingered monster!

Don’t get frightened or run for cover under your towel yet. After spending lots of time in the water, it’s totally normal for fingers (and sometimes toes) to wrinkle.

Even though you can’t see it, your skin is covered with its own special oil called sebum. Sebum is found on the outermost layer of skin. Sebum lubricates and protects your skin. It also makes your skin a bit waterproof. That’s why getting caught in the rain, hopping in the shower after a game, or washing your hands before dinner won’t leave your skin soggy. Sebum is there to keep the water out.

Why are Human Voices Different?

Wed, 15 Mar 2000 12:11:25 +0000

Imagine a scenario. A criminal is being tried in court. He denies saying something. The prosecution brings a recording, saying they have his confession on tape. As the accused vigorously denies the voice being his, an expert shows just why the voice could be no one else’s.

A fictional scene? Perhaps, but it is a reality that no two persons in the world have exactly the same voices. Do you know why this is so?

Why is the Dead Sea dead?

Mon, 07 Mar 2005 13:54:44 +0000

The Dead Sea is indeed a very scary name for a lake. It is called so because nothing lives in it. There are no sea weeds or plants, no fish either. This is because the Dead Sea is nearly six times as salty as the ocean.

It also contains many other dissolved minerals, including magnesium chloride, calcium chloride and potassium chloride in large quantities. Whereas in fresh water, only minute quantities of these minerals are found. The high concentration of salt makes plant or animal life impossible.

Why doesn't our stomach get digested?

Mon, 04 Apr 2005 18:26:52 +0000

All the food we eat goes into our stomach. Here, it is broken into smaller and simpler substances and get absorbed into the blood. Then, the blood carries these food particles to the different cells of the body, where they are used to provide energy to our body.

Why doesn’t our stomach get digested?

How is food broken into smaller particles?

Why does the Sun follow You?

Thu, 18 Aug 2005 19:55:18 +0000

Have you ever noticed that when you are in a car, or a bus, travelling on a straight road, the Sun appears to move right along with you?

While telephone poles and trees close to the road, whiz past in the blink of an eye, the Sun is always visible throughout the journey. No matter how fast Daddy drives, you just cannot leave the Sun behind.

Strangely enough, the trees nearer the road disappear from your range of vision more quickly than the trees further off. Why is this so?

Why is it Harder to Walk Uphill?

Sat, 25 Nov 2000 01:07:23 +0000

Raju heard the familiar cry of the ice-cream seller reach his ears, clear as a bell, even from his fourth floor apartment. He flew out of the flat and bounded down the stairs four steps at a time. The lift being under temporary repair, he had to take the stairs. He arrived downstairs a little breathless, and extremely impatient to have his ice-cream.

After buying it, he decided to rush home so he could eat it in peace. The climbing upstairs bit was a pain though. It always was. He had barely gone one flight of stairs when his knees began to hurt, and he felt majorly out of breath.

Why is the Bridge of Sighs so Called?

Wed, 28 Feb 2001 07:05:26 +0000

The Bridge of Sighs (Ponte de Sospiri), is in Venice, Italy, and connects the inquisitor’s room in the east side of the Doge’s palace with the state’s prison or prigioni over the Rio de Palazzo.

Work on the Doge’s palace (residence of the Duke) or Palazzo Ducale was begun in the 14th century and got its present shape only by the 16th century. The palace was not only the Doge’s residence and thus contained the inquisitor’s (judge) office, it also housed many other institutions like lawyers offices, the Chancellery, Naval Offices, etc.

Why Do we Get Tired?

Fri, 03 Aug 2001 12:03:42 +0000

Sumit was a tireless bundle of energy. He was always up to some mischief or the other. As he grew, to his mother’s relief he became a more relaxed child, and over the years his energy level seems to have come down considerably. However, now he feels tired and fatigued. At times he wonders why he gets so tired so soon when there is so much that he wants to do?

What is it in our body that causes fatigue? Why do we feel listless and sapped of strength at times? Fatigue is caused by a kind of poisoning produced by our organs. When a muscle in our body works, it produces lactic acid. If we remove the lactic acid from a tired muscle, it is able to start working at once.

Why Do Plants Bear Fruit?

Tue, 30 Sep 1997 07:15:29 +0000

Do you like fruits? Have you ever wondered why plants produce fruits? Is it only because nature wants you to enjoy eating its fruits and sing its praises?

The answer is no. Plants are much smarter than what you think they are. They actually use human beings, animals and birds who eat their fruits to propagate their kind. In other words, disperse their seeds.

The fruit serves as a mother’s womb where the embryo of a baby plant is nurtured. It protects the embryo, or the seed, in almost the same way as the mother protects her small ones. The flesh of the fruit serves as a protective lining as the seed develops. And, before the seed is ready to be sowed, the fruit is unripe and tastes sour. The sourness of the fruit discourages us from eating it.

Why Do Stars Twinkle?

Fri, 04 Sep 1998 21:44:16 +0000

Watching stars on a moonless night can be an quite an interesting experience. As clusters of stars take familiar forms – of a bear, a man in armor wielding a sword, millions of other stars simply twinkle. As if they were playing hide and seek with one’s eyes.

We all know that each star is actually like the sun. And the huge collection of stars on the night sky is like a collection of many, many suns. But, the sun does not twinkle, one would point out. So why do other stars twinkle?

Why does Milk spill over when it Boils?

Wed, 09 Oct 2002 20:50:36 +0000

How many times have you seen milk boil and spill over, and wondered why this happens? To answer this question we have to know a little more about the composition of milk.

Milk and its composition
Unlike water, milk is not a simple liquid. It is a colloid and contains many substances in suspended form. These substances are mainly protein, sugar and fat. When milk is heated slowly, the proteins and fat get separated. Since they are lighter than the milk they collect on the surface in the form of a layer called cream.

Why do Flies have Compound Eyes?

Fri, 11 May 2001 00:04:44 +0000

Just like a man woos the woman he loves, takes her to nice restaurants, buys her presents, and courts her to impress her before marriage, animals too choose their mates through courtship.

Since animals cannot do all these, they do it differently. Some animals put up a colourful display, while others give little gifts to their beloved – a choice worm, a designer nest and so on. A few species display their love through a series of grunts and others, like the Saurus crane or the stickleback fish, perform an intricate courtship dance.

Why is the Mediterranean Sea Blue?

Wed, 19 Jan 2000 02:23:58 +0000

We know that about seventy one per cent of the earth’s surface is covered with water. The earth’s three main Oceans are the Atlantic, the Pacific and the Indian Ocean.

The Atlantic Ocean is a great mass of water that separates Europe and Africa from America. It is shaped like a great hour-glass-with a ‘waist’ where Africa and South America bulge out towards each other. Although in area it is less than half the Pacific, it has many ‘secondary’ seas, such as the Arctic Ocean and the Mediterranean Sea.

Why do Humans Sweat?

Tue, 15 Oct 2002 01:52:22 +0000

It is an annual ritual in most Indian homes. With the onset of summer it is time to bring the rusty, rickety old coolers down from the terrace and get them repaired. The reason is obvious – it is difficult to live through the hot, sweaty Indian summer without an air cooler. But did you know that the human body has its own cooler as well?

Think of the times you have travelled in a car. How hot the vehicle engine gets after a long journey. Similarly, as our bodies chug along they produce heat in the process.
They normally maintain a temperature of 98.6 degrees Fahrenheit (37 degree Celsius) and become feverish if it rises above this point.

Why do Doctors Examine the Pulse?

Tue, 14 Nov 2000 13:23:52 +0000

If you place the first three fingers of your hand on the inside of your wrist, a dull throbbing reverberates through your hand. Da-dub, da-dub, da-dub. Very reassuring, these gentle thuds, that remind us that our bodies are kicking along, and that, at least at last touch, we’re alive and well.

By pulse we mean the regular throbbing of arteries caused by the successive contractions of the heart. During the action of the heart there is a pause. During this pause, the wall of the aorta contracts. The aorta is the great trunk artery that carries blood from the heart to the rest of the body.

Why was the Berlin Wall Built?

Sat, 29 Sep 2001 00:30:39 +0000

A few tentative steps across Checkpoint Charlie and you were transported to a different world. One side had McDonalds, Coke, Toyota cars and a democratically elected government. Across the Checkpoint, was a world of state-owned factories, rows and rows of identical apartments, and a self-imposed government. This was the world of the two Berlins divided by barbed wire, watch dogs, tanks, and an imposing wall.

In 1945, following World War II, Germany was divided into two countries – East Germany and West Germany. East Germany was controlled by the communist regime of the Soviet Union while West Germany became a democracy supported by the United States. Berlin, the former capital city, although entirely within East German borders, was also split into two.

Why does Cutting Onions Make us Cry?

Thu, 29 Nov 2001 08:49:44 +0000

If you cut an onion, you begin crying. Have you ever wondered why this happens — why onions make tears run down your face?

Well, onions contain a oil, which has lots of sulphur in it. When you cut the onion, this oil is released. It evaporates very fast. When the oil gases reach your eyes, it causes irritation and sends signals to your tear gland to produce tears. So that the tears can wash away the irritant from your eyes.

Why Does Time Start in Greenwich?

Tue, 09 Oct 2001 04:38:38 +0000

Its six in the morning and the sun is streaming through the window of your home in Delhi. In New York, people are just packing up to go home as it is six in the evening!

Nothing amazing about it. We know that the earth is round and that it revolves once in 24 hours. So while it is daytime in the east, it is still night in the west.

But for ages, people measured time based on the position of the sun – it was noon when the sun was highest in the sky.

Why do Cats Always Land on Their Feet?

Wed, 22 Oct 2003 00:43:52 +0000

When someone falls from the fourth or fifth floor, and survives, we call it a miracle. When a cat falls from that height, we watch astonished as it lands on all fours, pauses, then straighten up and walks away looking just a little fazed. What would you call this, a miracle or God’s grace?

Any guesses why cats survive while humans don’t? Well, it all has to do with the in-built ability of a cat to adjust its position during a sudden fall, its light weight and lithe muscular body. While humans tumble uncontrollably and completely lose control over their bodies when they fall, cats are able to straighten themselves even in mid-air and manage to fall on their feet.

Why do We Cup Our Hands When We Shout?

Wed, 21 Aug 2002 23:23:05 +0000

“Go on Sanjay, go on,” we shouted. It was the annual sports meet in our school and the 100 metres sprint was on. The White House runner Deepak was giving our Blue House sprinter, Sanjay, tough competition.

As the sprinters neared the finishing line, and the shouts turned into screams, I noticed something remarkable. Everyone had cupped their hands around their mouths while shouting.

The gesture caught my attention. I had seen that kind of a hand movement in plays and folk dances. What is the reason behind this theatrical gesture?

Why do Meteorites Strike the Earth?

Sat, 27 Apr 2002 10:32:14 +0000

On a hot summer afternoon, I sat down with my elder brother to play carom. I took the first strike and pocketed two coins. Then I did a little war dance. Wow!

Suddenly dada (Bengali for elder brother) had an idea. “How would it be if a fast-travelling object hit the earth? Quite like the way the striker hit the coins.”

I was amused. “How is it possible? The earth is so huge. Anyway there aren’t any strikers flying around in the solar system?”

Why are Zebras Striped?

Sat, 09 Nov 2002 16:23:19 +0000

As a child I was always full of questions. I remember asking my parents why zebras were striped or why did giraffes have such a long neck. Most of the time the answers were elusive and I used to be very irritated. I could never get the right answer to satisfy my curiosity. I now realize why my parents could not give me a concrete answer. You see I happened to be in the same dilemma when my three-year-old daughter asked me the same question! I was faced with the difficult task of giving her half-baked answers or finding the right answers this time.

Why Do Horses Need Shoes?

Fri, 30 Oct 1998 21:01:00 +0000

Clip-clop, clip-clop goes a horse on the road. If you look carefully you will see that it walks on the tips of its toes – like a ballet dancer. Walking on tiptoe for a long time is difficult for us, but horses find it the easiest thing to do.

The foot of a horse is divided into a toe with a broad tip. While other animals have nails and claws, the horse has a hoof surrounding the toe. The hoof area cannot feel any sensation; it is made of dead tissue (A similar example is our fingernails: we do not feel any pain while cutting them, because they are made of dead tissue.) The heels of the horse do not touch the ground.

Why do People Kiss Under the Mistletoe?

Tue, 31 Jul 2001 02:09:33 +0000

In millions of homes in Europe and America, a sprig of mistletoe with berries is hung outside the doorway at Christmastime. According to custom, a man is allowed to kiss a girl if she is standing under the mistletoe.

Why do People Kiss Under the Mistletoe?

Legend has it that when Balder, the son of the Norse goddess Frigga was killed by an arrow made of mistletoe by Loki, an evil spirit, Frigga wept tears of white berries which brought him back to life. Overjoyed, Frigga blessed the plant and bestowed to kiss all who passed beneath it.

Why do Airplanes have Wings?

Tue, 23 Apr 2002 01:14:32 +0000

I remember my trip to Goa. The flight was scheduled for six a.m. As the aeroplane taxied on the runway it gained speed. I felt a kick in the stomach and then we were airborne. It was my first flight and I was very excited. My father who was sitting next to me, asked, “Can you tell me how the aircraft flies?”

“Because of wings,” I replied promptly. But I could not tell him what the wings do to make a plane fly.

Why do Beavers Build Dams?

Thu, 22 Jul 1999 20:24:04 +0000

Picture a giant rat with a flat tail and webbed feet. That’s what the beaver looks like.

There are two kinds of beavers: the American and the European. The European beaver, found in Norway, Poland, Germany and France, lives in burrows.

But the American beaver builds a dam across a stream or lake to construct his home or lodge. The lodges are made of huge logs of trees.

The American beaver constructs solid dams and lodges because it has the mind of an expert engineer among all the creatures in the animal kingdom. And it is hard-working too. Moreover, building fortress like lodges and dams helps it escape unfriendly animals.

Why do Onions Make us Cry?

Fri, 09 Aug 2002 01:30:57 +0000

One of the earliest memories I have as a child is when I was approximately three or four years old. I remember watching my mother work in the kitchen. She was cutting onions for the salad and I could see tears in her eyes. For a child the worst possible thing is to watch his/her mother cry. I got so upset that I got hysterical at my father for causing her pain. For I assumed my father was somehow responsible as we were only the three of us in our family.

The Hows and Whys of Bubble Gum

Mon, 15 May 2000 04:09:54 +0000

Chew this question: What is small and pink, tastes sweet, can be chewed for hours without it dissolving, yet is not to be swallowed? Some doctors feel that it helps to relieve stress. Others think it is good for the teeth. Americans are constantly rolling it about in their mouth and the US army gives it as part of field rations. No guesses for the correct answer. Yes, it is chewing gum or bubble gum as it is often called because you can blow large bubbles that go ‘pop’!

Why do Earthquakes Occur?

Thu, 29 Jul 1999 07:19:27 +0000

As a result of upheavals below its surface, the earth shakes now and then. This shaking of the earth is known as an earthquake.

Few natural events are as violently destructive as an earthquake. It usually strikes without warning, giving off violent vibrations in the process. These vibrations not only shake the ground but also sometimes crack it open. And then, there is chaos, for earthquakes have been known to wipe out cities and civilisations.

Why does Cola Fizz?

Fri, 06 Jun 2003 14:39:37 +0000

Switch on the television and you are bound to see some cola advertisements. Aamir Khan, a Bollywood hero, pops open a cola and the bubbly drink fizzes to the top. Have you ever wondered what causes the countless teeny bubbles in all these soft drinks?

Soft drinks are carbonated, i.e. carbon dioxide gas is dissolved in the liquid. This gas gives the drink its sparkle and tangy taste, and prevents it from spoiling (the gas reduces bacterial growth).

Why do we Blink?

Fri, 28 Nov 2003 18:17:35 +0000

How many times do you blink in a minute? Weird, who knows! Well, mostly people blink around 15 times a minute (Reader’s Digest – Why in the World).

Blinking is an involuntary action that protects the eye. Most of our eye is enclosed in a bony socket covered with a layer of fat, which forms a protective cover. But when the eyes are open, one-tenth of the total surface area is exposed to the atmosphere. This means the eye, the most delicate and sensitive part of the body, has to withstand the dust present in the air.

Why Do Turtles and Tortoises Live So Long?

Sun, 23 Nov 1997 04:39:31 +0000

Turtles and tortoises have been on planet Earth even before the dinosaurs. They are that old. The difference between a turtle and tortoise is that the turtle stays in water while the tortoise stays on land. But both creatures have one thing in common: they live to a ripe old age, from 120 years to almost 200 years!

Some of them are huge, like the giant tortoises of the Galapagos Islands – they weigh beyond 200 kg; their shells are more than a metre long. The beauty is that they hatch from eggs that are no bigger than a hen’s!

Why do we See a Face on the Moon

Sun, 17 Mar 1996 20:04:41 +0000

When people say that they see a man’s face on the Moon, they are actually seeing the uneven surface on the Moon. There are deep holes, called craters, and hills on the Moon’s surface. There is no man on the Moon.

That the Moon is much smaller than the stars and even the earth. In fact, four moons put together would make one earth. The Moon looks big because it is much closer to us in comparison to the stars.

Why do Locusts Swarm?

Sat, 13 Dec 2003 15:57:51 +0000

Have you ever tried chasing a frisky grasshopper? If you have, you will definitely know that scampering after a jumpy bug is not an easy task. Most species of grasshoppers have a keen sense of hearing and the moment they sense trouble, they can hop fast and furious!

Sometimes, shortage of food turns grasshoppers into migratory insects as they venture out in search of newer pastures. This situation happens when the species begins reproducing rapidly and does not have enough food for all the members of its community.

Why are Some Reptiles Brightly Coloured?

Thu, 05 Aug 1999 11:47:40 +0000

Most animals have skin colour that makes them merge into their surroundings. They become near invisible unless you look very closely. But some reptiles such as the sea-snakes, coral snakes and frogs of Central and South America are brilliantly coloured or have bright bands like deep yellow, orange, pink on their bodies.

They are easily visible among the green leaves or brown earth. This is because these animals are poisonous. The colouring is a warning to other animals, especially their natural enemies, to avoid eating them. The frogs of Central America called the dart-poison frogs secrete a poison from their skin.

Why do some Rivers Flow Underground

Mon, 17 Apr 2000 12:28:40 +0000

From ancient times, people have settled down along the banks of rivers, since they provide water to drink, to irrigate their fields, and to use as waterways to go from one place to another.

But hidden away, below the earth, are rivers that we rarely see, until they surface near the sea, or when they merge with another river. Some have names and are talked of with a sense of mystery, but many are nameless streams that flow through the nooks and crannies of the earth.

Why is the Ball-point Pen Called So?

Tue, 14 Oct 2003 05:05:22 +0000

Writing is one of the most important inventions. Humans first used brushes for writing, then thick reeds were used. Feathers were used in medieval Europe for writing.

In the mid-19 century, metallic pens and nibs were widely used, while the fountain pen was produced in 1884 by the American, LE Waterman. However, these pens had a lot of problems. The ink would spill and blot very frequently and writing was cumbersome.

The first ball-point pen was invented by an Hungarian journalist, Ladislo Biro, in 1938. Biro had noticed that the type of ink used in newspaper printing dried quickly and did not smudge the paper. He decided to make a pen using the same type of ink. However, that thick ink could not flow through the normal pen nib, so he tried something else. And that is how the ball-point-pen was born.

Why are Some Plants Non-vegetarian?

Sat, 01 Jun 1996 09:32:17 +0000

Are you scared of going to the forest because you think there are man-eating tigers in the forest? What would you do if there were man-eating plants too?

Don’t worry. Man-eating plants do not exist. But insect and animal-eating plants do. They are what you would call non-vegetarian plants.

In fact, there are 500 varieties of plant species that trap prey and eat it. The most famous among these carnivorous plants are sundews, pitcher plants, bladderworts and the Venus flytrap.

Why do Aircrafts Have a Black Box?

Tue, 24 Apr 2001 16:31:18 +0000

Often, after an air disaster, we hear about the black box in the news. The black box does not play any part in making an aircraft fly but it serves an important function. It is basically an electronic device used by investigators to discover the cause of a crash and may be, prevent others.

Why do Aircrafts Have a Black Box? [Illustration by Shiju George]

The black box can be inserted or removed from an aircraft. In a passenger aircraft there are actually two black boxes. One contains the flight data-recorder and the other, the cockpit-voice recorder.

Why is Snow White?

Mon, 29 Jul 2002 13:35:53 +0000

I am sure like my two kids, all of seven and three years, you too may find the cold in Delhi a bit too extreme. It is cold and clammy and some days it is foggy making it dangerous to drive. Some days I would like them to be adequately muffled up in warm winter clothing, while they feel quite comfortable running around in a sweater and shorts! But most days it was grumble, grumble, grumble!

Why does a Cricket Ball Swing?

Sun, 11 Mar 2001 20:21:37 +0000

How many times have all of us heard that the former captain of the Indian cricket team, Kapil Dev, was one of the greatest out-swing bowlers of all times. Indeed! He took more than 430 wickets in Test cricket. But, do you know how a cricket ball swings?

The term ‘swing’ refers to the movement of the cricket ball in the air after it leaves the bowler’s hand, which takes the ball away from or towards the batsman. If the ball moves away from the batsman it is called an out-swinger; if the ball moves towards the batsman it is called the in-swinger.

Why are Eggs Oval?

Sun, 02 May 1999 07:09:24 +0000

Have you ever climbed a tree and peeked into the nest of a crow or a sparrow? Or looked into that flowerpot where the noisy pigeon decided to lay its eggs? The sight of a mother hen sitting on a bunch of fresh white eggs is great, though most of us see them only when they land on the breakfast table every now and then.

Eggs come in different colours. They may be blue, blue-green, yellow, spotted, blotched or white. No egg looks identical. Even those eggs that are laid in a clutch or at one time may have different colours. Most eggs are oval, and sometimes they are long and elongated. One end is slightly larger and heavier while the other end is smaller and conical.

Why's it hard for Ketchup to flow?

Mon, 21 Feb 2005 04:40:13 +0000

Why is it so tough to get ketchup out of the bottle?

Why’s it hard for Ketchup to flow? [Illustration by Shinod AP]

When you overturn a sauce bottle that has been left untouched for some time, chances are, either the sauce will not come out at all or a gigantic blob will plop down on your plate. Getting ketchup to ‘flow’ out of the bottle can be quite an ordeal.

Why Don't Spiders Get Caught in Their Webs?

Sun, 30 Dec 2001 11:34:30 +0000

Spiders are not insects but are classified by biologists as arachnids. Arachnids are different from insects as they have eight legs and no antennae. There are over 40,000 species of spiders and some of them build webs while others rely on speed to catch their prey.

A spider building its web is extremely fascinating to watch. Some spin these webs by squirting silken threads from modified excretory glands in their body. Each silk gland (some species have up to five) produces a different type of silk. Some silk glands produce a liquid silk that becomes dry outside the body; while other glands produce a sticky silk that stays sticky.

Why Do Rabbits have Buck Teeth?

Mon, 16 Jun 1997 07:32:55 +0000

What is it that makes every child remember Bugs Bunny? Its toothy smile of course! All rabbits have huge buck teeth in front, and with good reason. Being vegetarians they have to make a meal of leaf, grass, or vegetable.

The plants, on their part, are very smart. Over a period of time they have developed ways of protecting their leaves from such animals, for they need leaves to make their own food.

They have many ways of dealing with animals such as rabbits: they have thorns and needles, or their leaves have certain chemicals that weaken the teeth of chewing animals. So much so that the animal may die because it is no longer able to chew food.

Why do Woollens Get Holes?

Sun, 16 Jul 2000 07:18:44 +0000

Most people think moths are responsible for eating up our woollen clothes, furs and rugs and making holes in them. This is because when we open these boxes in spring, a number of moths fly out. Don’t you believe it! Moths do not eat wool.

It is the larvae (caterpillar) of certain moths that cause holes in our woollens. Caterpillars feed on wool, furs and other fabrics and damage them. But where do these caterpillars come from? The lifecycle of moths, butterflies and sawflies is in four stages – eggs, larva (caterpillar), pupa and adult.

Why are Moths Attracted to Light?

Thu, 14 Jun 2001 23:16:46 +0000

Have you seen moths zoom into a flame and die? It looks as if they are pulled by some unseen force.

It is an unseen force that attracts the moth — the ultraviolent light in the flame, which is invisible to humans. The moth finds it irresistible. It is driven to the light by its mating instinct.

Why are Moths attracted to light?

Ultraviolet vision helps moths get together in the dark. And it is the heat coming from their bodies that makes them aware of each other. Thus, the heat waves from the flame seem like the powerful signals sent by a supermoth. And the moths fall for it every time. They obviously do not learn from their mistakes.

Why were the 1904 Olympics Such a Disaster?

Wed, 11 Apr 2001 10:45:43 +0000

The 2000 Summer Olympics at Sydney were a millennium extravaganza unparalelled in the history of the Games. Techno-wizardry was at its best and the spectacular pageantry and the actual Games thrilled millions of viewers worldwide.

Hosting the Games is big business. What the host country spends is trifling compared to the amount of money it receives by way of advertising revenue and tourist influx.

Since 1896 when the modern Olympic Games were first held, the Games have undergone many upheavals. They were launched in 1896 to promote sports and test the sporting skills of humans in various categories. Over the years though, the true spirit has been lost as participating countries turn a blind eye to notions of honour and fair play. Instead, the focus is on winning either by hook or crook.

Why do Ears Pop?

Mon, 26 Oct 1998 01:08:58 +0000

Recently I went to the top of a skyscraper in a lift. After I had gone up a few stories, I felt a funny sensation in my ears. My eardrums seemed like they were growing and were about to burst. As I went a little higher, the sensation was worse. My fellow passengers in the lift told me to swallow a few times. This would help the sensation pass, they said. And, it did.
This happens to a lot of people when they are flying, or skiing downhill at very high speeds, or going deep into a mine well.

Why do Some People snore More than Others?

Sat, 28 Jun 2003 21:04:24 +0000

If you ever slept in a room with an uncle or an aunt who snores, you would know how annoying it can be. The person causing all the noise sleeps like a log, while the room partner spends the night tossing and turning; waking up bleary-eyed the next morning.

Did you know that snoring is a common ailment all over the world? Believe it or not, but on an average one in every four adults snores, says the website sleepquest.com, a site listed by Britannica.

Why do we Get Hiccups?

Fri, 25 Aug 2000 04:04:30 +0000

Hic! You’ve just hiccuped for what seems like the tenth time since you finished your big dinner. Wonder where these funny noises are coming from? The part to blame is your diaphragm, a dome-shaped muscle at the bottom of your chest, and all hiccups start here.

The diaphragm almost always works perfectly. It pulls down when you inhale to help pull air into the lungs, and it pushes up when you exhale to help push air out of the lungs.

Why do we Yawn?

Sat, 13 Apr 2002 13:56:37 +0000

Do you think that a great big yawn means you are really bored? Well, if you do, then you cannot possibly be further from the truth. Until recently many researchers used to think yawning is essential to increasing the oxygen intake to the lungs. A few on the other hand insisted that yawning is similar to stretching as it increases blood pressure and heart beat rate.

While both research findings are correct, new studies show that yawning actually perks you up instead of doing the opposite (as many of us seem to think). Scientists point out that we have a tendency to yawn before a big event – athletes yawn before a race, pilots yawn before take-off and you yawn before an exam.

Why is Hair Today, Gone Tomorrow?

Mon, 26 Nov 2001 12:47:32 +0000

Here’s a quiz question: what is curly or straight and needs to be combed, brushed, plaited or twisted? It is gelled, shampooed, dyed, coloured black, blonde, white, red, brown and needs to be cut once in a while. A hint – the answer is above your head – it’s your hair!

Each time you pass by a mirror, the one thing that strikes you is the hair on your head. Hair is something that grows by itself without any help. Well, actually, brushing and combing and even oiling it does help or else you tend to lose your hair.

Why do Some People Stutter?

Wed, 29 Mar 2000 02:19:20 +0000

Rahul is a lonely child. He is laughed at because whenever he speaks, he stutters. He goes “my name is Ra-Ra-Rahul.” His mother and grandmother thought it was because he had a short tongue. Other people said it was because, as a baby, Rahul’s hair was cut before he spoke his first word. Finally, Rahul’s mother took him to the doctor. She was told that it had nothing to do with these myths. Rather, Rahul had a speech disorder called dysphemia.

Why Do Knuckles Pop?

Mon, 27 Aug 2001 07:48:35 +0000

Have you ever laced your fingers together and bent your fingers back? If you pressed hard on any bent finger, you would have heard a popping sound? Finger joints produce that loud c-r-a-c-king sound. The sound comes when bubbles in the fluid around the joint burst!

Our entire body is made of a skeleton of 206 bones. Bones help in giving shape and support to the body and help us move about. Our bones are not too long otherwise we would not be able to bend or grasp things. Bones fit together at joints which is the meeting place between different bones of the skeleton.

Why does a Kentish Plover Parent Desert its Family?

Wed, 27 Feb 2002 19:03:49 +0000

When couples exchange vows on the marriage day, they generally say ’till death do us part’. For a species of shore-dwelling bird called the Kentish Plover, it is ’till divorce do us part'.

Indeed, birds of this species usually leave their partners after the incubation (hatching) of the eggs and usually it is the female who moves on, while the male stays on to look after the babies. A recent study conducted by Andras Kosztolanyi of the University of Debrecen, in Hungary, sheds light on the reason behind this behaviour.