My Science School

 

Bleeding, also called hemorrhage, is the name used to describe blood loss. It can refer to blood loss inside the body, called internal bleeding, or to blood loss outside of the body, called external bleeding.

Blood loss can occur in almost any area of the body. Internal bleeding occurs when blood leaks out through a damaged blood vessel or organ. External bleeding happens when blood exits through a break in the skin

When blood from trauma irritates brain tissues, it causes swelling. This is known as cerebral edema. The pooled blood collects into a mass called a hematoma. These conditions increase pressure on nearby brain tissue, and that reduces vital blood flow and kills brain cells.

Bleeding can occur inside the brain, between the brain and the membranes that cover it, between the layers of the brain's covering or between the skull and the covering of the brain.

 

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Lifestyle factors that increase your risk of stroke include high blood pressure, smoking, diabetes, high blood cholesterol levels, heavy drinking, high salt and high fat diet and lack of exercise. Someone who has already experienced a stroke is at increased risk of having another.

High blood pressure (hypertension) is the most significant risk factor for stroke. Blood pressure refers to the pressure inside the arteries. Normal blood pressure is around 120/80, while high-normal blood pressure is 120/80 to 140/90. High blood pressure is when your blood pressure is consistently over 140/90. This is called ‘hypertension’.



Hypertension means that the blood is exerting more pressure than is normal or healthy. Over time, this weakens and damages blood vessel walls, which can lead to stroke, particularly cerebral haemorrhage.



Hypertension may also cause thickening of the artery walls, resulting in narrowing and eventual blockage of the vessel (ischaemic stroke). In atherosclerosis, the pressure of your pumping blood could ‘hose off’ debris from damaged artery walls. The circulating debris (called emboli) can cause a stroke by lodging in and blocking a blood vessel in the brain.

 

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A stroke, or "brain attack," occurs when blood circulation to the brain fails. Brain cells can die from decreased blood flow and the resulting lack of oxygen. There are two broad categories of stroke: those caused by a blockage of blood flow and those caused by bleeding into the brain. A blockage of a blood vessel in the brain or neck, called an ischemic stroke, is the most frequent cause of stroke and is responsible for about 80 percent of strokes. These blockages stem from three conditions: the formation of a clot within a blood vessel of the brain or neck, called thrombosis; the movement of a clot from another part of the body such as the heart to the brain, called embolism; or a severe narrowing of an artery in or leading to the brain, called stenosis. Bleeding into the brain or the spaces surrounding the brain causes the second type of stroke, called hemorrhagic stroke.

The most common symptoms of a stroke are:

• Weakness or numbness of the face, arm, or leg on one side of the body


• Loss of vision or dimming (like a curtain falling) in one or both eyes


• Loss of speech, difficulty talking, or understanding what others are saying


• Sudden, severe headache with no known cause


• Loss of balance or unstable walking, usually combined with another symptom

 

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Lata Mangeshkar (born as Hema Mangeshkar on 28 September 1929)) is an Indian playback singer and music director. She is one of the best-known and most respected playback singers in India. She has recorded songs in over a thousand Hindi films and has sung songs in over thirty-six regional Indian languages and foreign languages, though primarily in Marathi, Hindi, Bengali and Assamese.

The Dadasaheb Phalke Award was bestowed on her in 1989 by the Government of India. In 2001, in recognition of her contributions to the nation, she was awarded the Bharat Ratna, India's highest civilian honour and is only the second vocalist, after M. S. Subbulakshmi, to receive this honour. France conferred on her its highest civilian award, the Officer of the Legion of Honour, in 2007.

Lata is the eldest child of the family. Meena, Asha, Usha, and Hridaynath, in birth order, are her siblings; all are accomplished singers and musicians.

Lata received her first music lesson from her father. At the age of five, she started to work as an actress in her father's musical plays (Sangeet Natak in Marathi). On her first day of school, she left school because they would not allow her to bring her sister Asha with her, as she would often bring her younger sister with her.

 

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Madurai Shanmukhavadivu Subbulakshmi is a name that is synonymous with the world of Carnatic music. This flawless singer, whose voice almost had a divine power, is the first singer to be presented with India’s highest civil honour, the Bharat Ratna. When she was honoured with the Ramon Magsaysay award, which is considered as Asia's Nobel Prize, she became the first Indian musician to do so. Subbulakshmi, fondly addressed as M.S by her fans, was a true pioneer of anything that has to do with women empowerment. She led by example and showed the way to contemporary women of her era. 

Subbulakshmi began her training under her mother Shanmu kavadiver Ammal. She then went on to learn the nuances of Carnatic music under Semmangudi Srinivasa Iyer. While learning Carnatic music, she also learnt and mastered Hindustani music under the famous vocalist Pandit Narayanrao Vyas. M.S was a quick learner and thus finished her education at a young age.

The great talent that M.S possessed brought a galaxy of fans. Her fan list included the likes of Mahatma Gandhi, Jawaharlal Nehru, Sarojini Naidu, Lata Mangeshkar, Ustad Bade Ghulam Ali Khan and Kishori Amonkar. Mahatma Gandhi once commented that he would rather hear Subbulakshmi utter the lyrics of the songs rather than hear someone else sing it. While Jawaharlal Nehru called her the ‘Queen of Music’, Bade Ghulam Ali defined her as the ‘Goddess of perfect note’. In the year 1998, M. S. Subbulakshmi became the first musician to be honored with India's highest civilian award.

 

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Bhupen Hazarika, who was posthumously awarded Bharat Ratna in 2019, was a singer, balladeer, poet, lyricist and film maker who was widely admired not only in native Assam but across the country.

He started out as a child actor and wrote and sang his first song at the age of 10. His famous song, `O Ganga, tum bhati ho kyun' is sung across homes in India. Hazarika created his own ode to the Brahmaputra. His song on Bangladesh's liberation was very popular and he was well-known in Nepal.

Hazarika was popularly known as Bhupenda in Assam and awaded with titles like Sudhakantha.

He had joined the BJP ahead of 2004 Lok Sabha elections impressed by the performance of Atal Bihari Vajpayee government though he desisted bondage of a political party. He had also been an independent member of the Assam Assembly.

 

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Amartya Sen is an Indian economist and philosopher. He has worked in India, the United Kingdom and the United States.

He was born on November 3rd, 1933, to a Bengali family of Santiniketan in West Bengal. He is the second Indian after Rabindranath Tagore to receive a Nobel Prize.

Sen's first book 'Collective Choice and Social Welfare' was launched around 1970. This book was considered to be one of the most influential monographs that speak about the issue of primary welfare, justice, equality and individual rights.

His publication 'Development as freedom' got the recognition of the Nobel Prize committee. In 1992 he came up with his book 'Inequality Re-examined' which covered all the important themes of his work. In 1998 he received the Nobel Memorial Prize in Economic Sciences for his contribution to 'Welfare Economics'. He also won the Bharat Ratna award IN 1999, the highest civilian award in India and the National Humanities Medal ward in 2011.

 

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Kamaraj was awarded India's highest civilian honour, the Bharat Ratna, posthumously in 1976. The domestic terminal of the Chennai airport is named "Kamaraj Terminal". Marina beach road in Chennai was named as "Kamarajar Salai". North Parade Road in Bengaluru and Parliament road in New Delhi were also renamed after Kamaraj. Madurai Kamaraj University is named in his honour. In 2003, the Government of India released a commemorative coin on his birthday.

After Nehru's death in 1964, Kamaraj successfully navigated the party through turbulent times. As the president of INC, he refused to become the next Prime Minister himself and was instrumental in bringing to power two Prime Ministers, Lal Bahadur Shastri in 1964 and Nehru's daughter Indira Gandhi in 1966. For this role, he was widely acclaimed as the "kingmaker" during the 1960s.

When the Congress split in 1969, Kamaraj became the leader of the Indian National Congress (Organisation) (INC(O)) in Tamil Nadu. The party fared poorly in the 1971 elections amid allegations of fraud by the opposition parties. He remained the leader of INC(O) until his death in 1975.

 

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The Soviet Union stunned the world on Nov. 3, 1957, with the launch of Sputnik 2. On board the small satellite was a little dog, Laika, the first animal to orbit Earth. However, Laika was not the first animal in space. The United States and the U.S.S.R. had been putting animals atop rockets since 1947.

Laika was a young, mostly-Siberian husky. She was rescued from the streets of Moscow. Soviet scientists assumed that a stray dog would have already learned to endure harsh conditions of hunger and cold temperatures. Laika and two other dogs were trained for space travel by being kept in small cages and learning to eat a nutritious gel that would be their food in space.

The dog's name was originally Kudryavka, or Little Curly, but she became known internationally as Laika, a Russian word for several breeds of dog similar to a husky. American reporters dubbed her Muttnik as a pun on Sputnik.

Unfortunately, Laika's trip into space was one-way only. A re-entry strategy could not be worked out in time for the launch. It is unknown exactly how long Laika lived in orbit — perhaps a few hours or a few days — until the power to her life-support system gave out. Sputnik 2 burned up in the upper atmosphere in April 1958.

 

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The Nobel Prize in Physics was awarded to three astrophysicists Tuesday for work that was literally out of the world, and indeed the universe. They are Roger Penrose, an Englishman, Reinhard Genzel, a German, and Andrea Ghez, an American. They were recognized for their work on the gateways to eternity known as black holes, massive objects that swallow light and everything else forever that falls in their unsparing maws.

Black holes were one of the first and most extreme predictions of Einstein’s General Theory of Relativity, first announced in November 1915. The theory explains the force we call gravity, as objects try to follow a straight line through a universe whose geometry is warped by matter and energy. As a result, planets as well as light beams follow curving paths, like balls going around a roulette wheel.

Einstein was taken aback a few months later when Karl Schwarzschild, a German astronomer, pointed out that the equations contained an apocalyptic prediction: In effect, cramming too much matter and energy inside too small a space would cause space-time to collapse into a point of infinite density called a singularity. In that place — if you could call it a place — neither Einstein’s equations nor any other physical law made sense.

Einstein could not fault the math, but he figured that in real life, nature would find a way to avoid such a calamity.

 

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It is intriguing that such a small planet can have such a complex collection of satellites. The discovery provides additional clues for unraveling how the Pluto system formed and evolved.

Pluto's entire moon system is believed to have formed by a collision between two the dwarf planet and another Kuiper Belt Object early in the history of the solar system. The smashup flung material that coalesced into the family of satellites observed around Pluto.

"The moons form a series of neatly nested orbits, a bit like Russian dolls," said Mark Showalter of the SETI Institute.

The known moons of Pluto are:

• Charon: Discovered in 1978, this small moon is almost half the size of Pluto. It is so big Pluto and Charon are sometimes referred to as a double planet system.


• Nix and Hydra: These small moons were found in 2005 by a Hubble Space Telescope team studying the Pluto system.


• Kerberos: Discovered in 2011, this tiny moon is located between the orbits of Nix and Hydra.


• Styx: Discovered in 2012, this little moon was found by a team of scientists searching for potential hazards to the New Horizons spacecraft Pluto flyby in July 2015.


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Remnants of an ancient water ocean are buried beneath the icy crust of dwarf planet Ceres — or, at least, lingering pockets of one. That’s the tantalizing find presented August 10 by scientists working on NASA’s Dawn mission. 

By far, Ceres is the largest object in the asteroid belt, which girdles the inner planets between Mars and Jupiter. But unlike its rockier neighbors, Ceres is a giant ice ball. It holds more water than any world in the inner solar except for Earth. That knowledge had long led some astronomers to suspect Ceres may have once had a subsurface ocean, which is part of the reason NASA sent the Dawn spacecraft there.

Ceres is the only dwarf planet in the inner solar system, and it locks up one-third of the entire mass in the asteroid belt. Astronomers think Ceres is a protoplanet, the fossilized remains of a world that never fully formed. But its growth was halted before it could become a full planet. Having such a history means Ceres likely holds an early record of our solar system's primordial past — hence the name Dawn.

 

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According to International Astronomical Union (IAU), which began meeting in August of 2006, the term Plutoid now applies to Pluto, as well as any other small stellar body that exist beyond the range of Neptune.

Pluto was to these stellar objects what Ceres was to large objects in the asteroid belt – that is to say, comparable in size. Astronomers proposed several names for these objects, but matters did not come to a head until Eris was discovered. This dwarf planet was actually larger than Pluto, 2500 km in diameter, making it twenty-seven percent larger than Pluto.

In the end, the IAU could only resolve this matter by removing Pluto from the list of planets and devising a new category for dwarf planets that could no longer be considered true planets. Plutoid was the result, and now applies to the trans-Neptunian objects of Pluto, Haumea, Makemake, and Eris.

 

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Jupiter is the fifth planet from our Sun and is, by far, the largest planet in the solar system – more than twice as massive as all the other planets combined. Jupiter's stripes and swirls are actually cold, windy clouds of ammonia and water, floating in an atmosphere of hydrogen and helium. Jupiter’s iconic Great Red Spot is a giant storm bigger than Earth that has raged for hundreds of years.

The composition of Jupiter is similar to that of the Sun—mostly hydrogen and helium. Deep in the atmosphere, pressure and temperature increase, compressing the hydrogen gas into a liquid. This gives Jupiter the largest ocean in the solar system—an ocean made of hydrogen instead of water. Scientists think that, at depths perhaps halfway to the planet's center, the pressure becomes so great that electrons are squeezed off the hydrogen atoms, making the liquid electrically conducting like metal. Jupiter's fast rotation is thought to drive electrical currents in this region, generating the planet's powerful magnetic field. It is still unclear if, deeper down, Jupiter has a central core of solid material or if it may be a thick, super-hot and dense soup. It could be up to 90,032 degrees Fahrenheit (50,000 degrees Celsius) down there, made mostly of iron and silicate minerals (similar to quartz).

 

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Valentina Vladimirovna Tereshkova born 6 March 1937) is a member of the Russian State Duma, engineer, and former cosmonaut. She is the first and youngest woman to have flown in space with a solo mission on the Vostok 6 on 16 June 1963. She orbited the Earth 48 times, spent almost three days in space, and to date remains the only woman to have been on a solo space mission.

Valentina Tereshkova was born on 6 March in 1937 in the Bolshoye Maslennikovo, a village on the Volga River 270 kilometres (170 mi) northeast of Moscow and part of the Yaroslavl Oblast in central Russia. Her parents had migrated from Belarus. Her father, Vladimir Tereshkov, was a former tractor driver and a sergeant in command of a tank in the Soviet Army. He died in the Finnish Winter War during World War II when Tereshkova was two years old. He and her mother Elena Fyodorovna Tereshkova had three children. After her father's death, her mother moved the family to Yaroslavl, seeking better employment opportunity, and became employed at the Krasny Perekop cotton mill.

After Yuri Gagarin became the first man in space in 1961, Tereshkova volunteered for the Soviet space program. Although she did not have any experience as a pilot, she was accepted into the program because of her 126 parachute jumps. At the time, cosmonauts had to parachute from their capsules seconds before they hit the ground on returning to Earth.

Along with four other women, Tereshkova received 18 months of training, which included tests to determine how she would react to long periods of time being alone, to extreme gravity conditions and to zero-gravity conditions. Of the five women, only Tereshkova went into space.

Tereshkova was chosen to pilot Vostok 6. It was to be a dual mission. Cosmonaut Valeriy Bykovsky launched on Vostok 5 on June 14, 1963.

 

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