What are Steroids?

Steroids are very useful and potent form of drugs. Although they have side-effects if administered with proper medical advice would definitely be life-saving. These are found in the body naturally. These are secreted by the adrenal glands as hormones. The steroids are of two types one that is found naturally the other is manufactured synthetically.

Steroids are medically administered in acute and chronic inflammatory conditions. In certain cases of acute asthma which does not respond to ordinary drugs steroids are used as life saving drug. It is also administered for people suffering because of ‘Addisons disease’ . This is a condition where the human body stops secreting natural hormones. However, if the steroids are administered for longer periods the body tends to decrease the secretion of natural steroids.


Steroids although has some vital uses, it also has certain side- effects like ulceration of the stomach, swelling of the neck, weakening of bones, Increasing the body hair, the skin would tend to lose its texture, blood pressure levels would increase in some cases.

In spite of all these side-effects the steroids are being misused world-wide, the most common types of misuses are : To provide instant relief from body aches, fever, in cases of skin inflammations.

Comets

Not long ago, many people thought that comets were a sign that something bad was about to happen to them. People didn't understand how objects in the sky moved, so the sight of a comet must have been very disturbing. There are many historical records and works of art which record the appearance of comets and link them with terrible events such as wars or plagues.

One of the most famous comets is Halley's comet named after the famous astronomer Edmund Halley. Halley accurately calculated its time to orbit around sun as 76 years. This comet appeared in 1910 after which it appeared 1986 after 76 years as calculated by the great astronomer. In 1985-1986, a spacecraft called Giotto visited the most famous comet, Halley, on Halley's most recent visit to the inner solar system.

Unlike the other small bodies in the solar system, comets have been known since antiquity. Comets are sometimes called dirty snowballs or "icy mud balls". Comets are invisible except when they are near the Sun. Comets are small, fragile, irregularly shaped bodies composed of a mixture of non-volatile grains and frozen gases. They have highly elliptical orbits that bring them very close to the Sun and swing them deeply into space, often beyond the orbit of Pluto. The Comet structure consists of the nucleus, coma, hydrogen cloud and a dust tail. Comet structures are diverse and very dynamic, but they all develop a surrounding cloud of diffuse material, called a coma, that usually grows in size and brightness as the comet approaches the Sun. Usually a small, bright nucleus (less than 10 km in diameter) is visible in the middle of the coma. The coma and the nucleus together constitute the head of the comet.

As comets approach the Sun they develop enormous tails of luminous material that extend for millions of kilometers from the head, away from the Sun. When far from the Sun, the nucleus is very cold and its material is frozen solid within the nucleus. In this state comets are sometimes referred to as a "dirty iceberg" or "dirty snowball," since over half of their material is ice. When a comet approaches within a few AU of the Sun, the surface of the nucleus begins to warm, and volatiles evaporate. The evaporated molecules boil off and carry small solid particles with them, forming the comet's coma of gas and dust. When the nucleus is frozen, it can be seen only by reflected sunlight.

Meteor shower sometimes occur when the Earth passes thru the orbit of a comet. Some occur with great regularity: the Perseid meteor shower occurs every year between August 9 and 13 when the Earth passes thru the orbit of Comet Swift-Tuttle.

Now we know that comets are lumps of ice and dust that periodically come into the center of the solar system from somewhere in its outer reaches, and that some comets make repeated trips. When comets get close enough to the Sun, heat makes them start to evaporate. Jets of gas and dust form long tails that we can see from Earth. These tails can sometimes be millions of miles long.

What is Paracetamol?

An individual is said to have fever if his or her body temperature exceeds 37 degree Celsius. Fever is a sign of illness. Fever causes a great deal of discomfort. Fever is usually a resultant of some viral attack. Fever is rarely complicated. Sometimes it could be accompanied by dehydration and convulsion. It is always recommended to wear light clothing and consume plenty of water when affected by fever.

Paracetamol is the most commonly used drug to treat fever. It is a mild but very effective drug. It is available in variety of names in the market. It is otherwise known as ‘Acetaminophen’. On consumption of paracetamol the body heat is reduced by sweating. Paracetamol can be used during pregnancy also as it is less toxic in nature. Sometimes high doses cause nausea, drowsiness etc., and sometimes may result in renal failure too. In such cases it is recommended to meet a doctor. Paracetamol also reduces body pain caused during fever.

It is available in the market in variety of dosages. For children it is available as syrup and in form of tablets for adults. Paracetamol injections are also available. When consumed in tablet form, on has to consume lot of water.

When being treated with paracetamol one has to restrict to the prescribed dosage. Avoid fasting while taking the tablet. Refrain from consuming alcohol during usage of paracetamol. Usage of paracetamol for children should be done only under medical advice and guidance.

What is Pituitary Gland?

One cannot imagine how a tiny gland located at the base of our brains controls the entire growth of the body. The erratic functioning of the pituitary gland can result in abnormal growth. Sandy Allan, a young woman in the U.S.A grew to an abnormal height of 7 ft and 7 inches because of the excessive secretion of the gland. Excess secretion can also happen after full body maturity. In such cases, only the hands, head and feet overgrow. On the contrary, lack of secretion of the gland can result in stunted growth, as it happened in the case of a Dutch woman, Pauline Musters, who could grow to 23 inches only, even after full maturity.

Courtesy: Indian Express

Bears - Where can they be found

• Bears can be found in all parts of the world except Antarctica, Africa and Australia.
• When a bear cub is born, it is about the size of a squirrel.
• Bears have excellent hearing capacity. Like dogs, they can hear very high pitches - far beyond anything humans can.
• Bears see in colour and have a pretty good vision.
• Bears have an excellent sense of smell. Their noses are extremely sensitive and they send messages to each other through airborne scent.
• Bears run fast. They can exceed speeds of 60 kmph faster than any professional human athlete!
• Bears are very, very strong. They can overturn massive rocks and logs and dig dens on tough mountain slopes.

Taste Buds

Anyone who is extremely fond of sweets is called sweet tooth, though the teeth does not identify the taste. Rather, its the tongue that does this function. The tongue is the most important organ which is wholly muscular and without any bones inside. It moves tactfully between the teeth without getting trapped. The granular lumps on the surface of the toungue are the taste buds having hair like fibers at the top ends. They get activated when we chew our food. They send impulses to the taste center in the brain which identifies the taste and helps us relish our food. The taste buds do not get activated if the food is dry or solid. Only when moistened wit saliva they are identified. The nose works in conjunction with the tongue in identifying the taste and relishing the food. the sensory nerves in the nose too send impulses to the brain and helps enhancing the pleasure of tasting and relishing food.

Dinosaurs

Dinosaurs lived on the earth millions of years ago even before the human life came into existence. They belong to the mezosoic era. The Dinosaurs are reptiles and most of them hhed from eggs. Predominantly the dinosaurs are herbivorous and fed on plants. Some kinds were carnivores also. Some dinosaurs were 100 ft long and abt 50 ft tall. They are land dewellers and never lived in water. There are no concrete proofs on how the dinosaurs sounded or how they mated. The fossils are found all over the world. They had thick bumpy skin. Its believed that they became extinct because of the environmental changes due to an asteroid that hit the earth. Its very difficult to acertain the sex of the dinosaur from its fossils. The oldest dinosaur is 'EORAPTOR'.

DOLPHINS

Dolphins belong to the family Delphinidae. They are very social creatures. They mainly rely on their sense of sound to understand the world around them.

Dolphins are carnivores. They feed on octopus, squids and fish. There are many varities of dolphins like Spotted Dolphin, Rough-toothed Dolphin,Bottlenose Dolphin, Pacific bottlenose dolphin, Spinner Dolphins. Dolphins are often found in small groups.

Dolphins possess a beak. The dolphin's skin is completely smooth allowing the dolphin to move easily through the water, and also reduce heat loss. Their skin may bear marks from other dolphins, due to playing or mating. Dolphins use their powerful tail in an up and down motion to move through the water. They also use their tails when hunting. Their teeth are interlocking rows of conical pegs, suitable for holding slippery fish. The dolphin's eyes produce a special slippery secretion which protects the eyes from foreign objects and water friction. Their foreheads slope almost uniformly to the tip of their beek. Dolphins breathe through their blowhole located at the top of their head.

Dolphins are mammals. Dolphins carry their young inside their womb and gestation is about 12 months for a bottlenose. The dolphin calves are born tail first and are nursed by the mother for one to two years. The mother helps the calf to catch her first breath.

The dolphin's anatomy helps it to swim very fast in water. Its smoothe slippery skin, wings and tail are desinged in a way to achieve high speeds.

Lightning Arrestors

Benjamin Fraklin was fond of kite flying. One day he was flying a kite made of silk cloth mounted to a wooden cross and fastened using a steel wire. The tail of the kite was connected to a long metal string at the center. The end of the string was connected to a silk ribbon which he held in his hand. He was enjoying his kite flying and suddenly a thunderstom broke out. A severe lightening flashed across the dense clouds. Suddenly Benjamin Franklin experienced severe shock in his hands and noticed there were sparks from the metal string. He panicked and left the kite, Soon he saw the ribbon in flames.

He realised that the dark clouds were laden with electrical chargeand the subsequent lightning produced heavy electric currentwhich passed through the metal string causing sparks. fortunately for him the silk ribbon he was holding was abad conductor of electricity and he dropped the kite well in time. He also realised that when ever lightening occurs, the electric current produced has the tendency to pass down to the earth through some medium. This gave birth to the invention of the lightning arrestors that are installed in tall buildings.

He thought that if a conducting medium is installed in tall buildings, it would attact the lightning current and pass it to the ground without afecting the building. All the modern day arrestors make use of the same principle.

What is solar enrgy?

If any form of energy is available in abundance in India its solar energy. Now the concept of solar power plants is slowly catching up. The steam generated from the large sized solar heaterscan be used to actuate a steam turbine which generates electric power through generator. Recently the tourist island of Bangaram, in Laskshadweep Islands, has acquired a solar power plant. Hitherto, it had to depend solely on diesel power plants, for which diesel was being transported from the mainland at a high cost. The Bangalore based electronic division of BHEL unit had earlier installed a solar power plant of 10kw capacity. This wass upgraded recently to 50kw hybrid solar pwer plant to ensure full power supply needed for the island. BHEL has installed 8 such power plants till date.

Moon and the Gravitational force

Have you ever wondered how the moon is able to hand in the sky like a giant balloon and why it is not pulled down by the gravitational force of the earth? After all, the earth has a powerful gravitational force sufficient to pull the moon downwards towards it. Considering the fact that the gravity on the moon is only one-sixth of that of the earth, it should have come crashing towards the earth long ago. Why then has this not happened? Isn't the earth pulling the moon with all its might towards it. In which case how does the moon resist it?

Though the moon appears to be stationery, it is, in fact, revolving round the earth in a steady orbit. As per Newton's law, every revolving object gives rise to a centrifugal force which tends to push the object radially outward from the centre of the revolution. The moon is revolving at a specific speed which creates a centrifugal force exactly equal and opposite to the pull of the earth. Thus the forces are balanced and the moon neither tens to move away from the earth, nor towards it. You might then wonder why the moon appears to be motionless! Objects closer to us appear to move more swiftly than when they are away from us. For instance, an aircraft while taking off seems to move very fast in the runway, but when it flies high in a clear sky, it appears to move slowly. So, it is no wonder the moon, which is 384400 km away from us, appears to be motionless, though it is revolving around us at a high speed.

What are Anagrams

Alexander Graham Bell, who invented the telephone, was also a writer. Wanting to make sure that his writings would not be appreciated solely because he was famous, he chose an alias HA Largelamb by mixing the alphabets of his name, A Graham Bell (This is called creating an anagram)

King louis XII of France was so fond of anagrams that he appointed Thomas Billon as the royal anagramatist. His full time job was to convert the names of the court nobles into funny anagrams, to amuse the king.

The Smallest Country

The Vatican is the smallest country in the world. It is an independent sovereign state within the bondaries of Rome, the capital of Italy. It became an independent state only after 1929. Right from inception, it has been the spiritual and administrative centre of the Roman Catholic Church. The city state has a daily newspaper, a railway station, and its own bank. It has an area of just 0.5 sq. km and a population of little over a thousand, though it attracts millions of visitors every year. The main attractions in the Vatican are the Michaelandgelo Frescoes in the Sistin Chapel and the imposing facade of St. Peter.