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Saturday, July 9, 2016

The Positive and Negative Effects of Video Games

The Positive and Negative Effects of Video Games


Is playing video games good or bad for you? It can be both.

Video games are frowned upon by parents as time-wasters, and worse, some education experts think that these games corrupt the brain.  Playing violent video games are easily blamed by the media and some experts as the reason why some young people become violent or commit extreme anti-social behavior.  But many scientists and psychologists find that video games can actually have many benefits – the main one is making kids smart.  Video games may actually teach kids high-level thinking skills that they will need in the future.
“Video games change your brain,” according to University of Wisconsin psychologist C. Shawn Green. Playing video games change the brain’s physical structure the same way as do learning to read, playing the piano, or navigating using a map. Much like exercise can build muscle, the powerful combination of concentration and rewarding surges of neurotransmitters like dopamine strengthen neural circuits that can build the brain.
Below are the good and bad effects of video games, according to researchers and child experts:

Positive Effects of Video Games

When your child plays video games, it gives his brain a real workout.  In many video games, the skills required to win involve abstract and high level thinking.  These skills are not even taught at school.  Some of the mental skills enhanced by video games include:
    1. Following instructions
    2. Problem solving and logic – When a child plays a game such as The Incredible Machine, Angry Birds or Cut The Rope, he trains his brain to come up with creative ways to solve puzzles and other problems in short bursts
    3. Hand-eye coordination, fine motor and spatial skills. In shooting games, the character may be running and shooting at the same time. This requires the real-world player to keep track of the position of the character, where he/she is heading, his speed, where the gun is aiming, if the gunfire is hitting the enemy, and so on. All these factors need to be taken into account, and then the player must then coordinate the brain’s interpretation and reaction with the movement in his hands and fingertips. This process requires a great deal of eye-hand coordination and visual-spatial ability to be successful.  Research also suggests that people can learn iconic, spatial, and visual attention skills from video games.  There have been even studies with adults showing that experience with video games is related to better surgical skills. Also, a reason given by experts as to why fighter pilots of today are more skillful is that this generation’s pilots are being weaned on video games.
    4. Planning, resource management and logistics.  The player learns to manage resources that are limited, and decide the best use of resources, the same way as in real life.  This skill is honed in strategy games such as SimCity, Age of Empires, and Railroad Tycoon. Notably, The American Planning Association, the trade association of urban planners and Maxis, the game creator, have claimed that SimCity has inspired a lot of its players to take a career in urban planning and architecture.
    5. Multitasking, simultaneous tracking of many shifting variables and managing multiple objectives.  In strategy games, for instance, while developing a city, an unexpected surprise like an enemy might emerge.  This forces the player to be flexible and quickly change tactics.
Thanks:



Negative Effects Of Video Games

1. Increases Aggressive Behavior:

Video games with violent content can lead to aggressive behavior in teens. It can also desensitize them to violence. Studies have shown that teens who like playing first-person shooter style games are likely to adopt a detached view of the society. They also develop aggressive thoughts and tendencies.

2. Social Isolation:

Another negative effect of video game is that teens are spending too much time playing games than playing outdoors. Video games are making teens socially isolated. Teenagers who play too much video games are also less likely to indulge in extracurricular activities like reading, writing and participating in sports.

3. Teaches Wrong Values:

Besides violent behavior, video game also teaches teens wrong values. Video games portray women as weaker characters. They depict women as helpless and sexually provocative personalities. Teens also pick up bad language and behavior while playing with other people online.

4. Poor Academic Performance:

This is one of the serious effects of video games on teens. Playing long hours of video games can affect your teen’s performance in school. If your teen spends more than two hours gaming, then he may have trouble falling asleep and paying attention in school. Video game addicts also skip their homework to play games, leading to a downfall in their grades.

5. Adverse Effects On Health:

Excessive gaming can have adverse effects on the teen’s health. Teenagers, by spending too much time playing video games, do not participate in activities that can keep them healthy and fit. It leads to obesity, muscular, skeletal and postural disorders, video-induced seizures, nerve compression and numbness in hands, elbows and shoulders.

Most kids plug into the world of television long before they enterschool. According to the  
Kaiser Family Foundation (KFF):
  • two-thirds of infants and toddlers watch a screen an average of 2hours a day
  • kids under age 6 watch an average of about 2 hours of screenmedia a day, primarily TV  
  • and videos or DVDs
  • kids and teens 8 to 18 years spend nearly 4 hours a day in frontof a TV screen and almost 
  • 2 additional hours on the computer(outside of schoolwork) and playing video games
The American Academy of Pediatrics (AAP) recommends that kidsunder 2 years old not  
watch any TV and that those older than 2watch no more than 1 to 2 hours a day of quality  
programming.
The first 2 years of life are considered a critical time for braindevelopment. TV and other 
electronic media can get in the way ofexploring, playing, and interacting with parents and  
others, whichencourages learning and healthy physical and social development.
As kids get older, too much screen time can interfere with activitiessuch as being physically 
active, reading, doing homework, playingwith friends, and spending time with family.
Of course, TV in moderation can be a good thing: Preschoolers canget help learning the 
 alphabet on public television, grade schoolerscan learn about wildlife on nature shows, 
 and parents can keep upwith current events on the evening news. 
 No doubt about it - TV canbe an excellent educator and entertainer.



  • Children who consistently spend more than 4 hours per daywatching TV are more likely to be overweight.
  • Kids who view violent acts on TV are more likely to showaggressive behavior, and to fear that the world is scary and thatsomething bad will happen to them.
  • TV characters often depict risky behaviors, such as smoking anddrinking, and also reinforce gender-role and racial stereotypes.
Children's advocates are divided when it comes to solutions.Although many urge for 
more hours per week of educationalprogramming, others assert that zero TV is the best  
solution. Andsome say it's better for parents to control the use of TV and to teachkids  
that it's for occasional entertainment, not for constant escapism.
That's why it's so important for you to monitor the content of TVprogramming and set 
viewing limits to ensure that your kidsdon't spend too much time parked in front of the TV.
 Thanks: http://kidshealth.org/

A newfound alien planet is bullied by three suns


A newly discovered alien world has three masters.




The planet — which is about four times more massive than Jupiter and located about 340 light-years from Earth — orbits the brightest star in a three-star system.
The two other stars in the system also orbit the brightest star, circling one another like a dumbbell and exerting their gravitational influence over the planet, named HD 131399Ab.
"For about half of the planet's orbit, which lasts 550 Earth-years, three stars are visible in the sky," Kevin Wagner, the lead author of a study in the journal Science detailing the new finding, said in a statement. He added:
For much of the planet’s year the stars appear close together, giving it a familiar night-side and day-side with a unique triple-sunset and sunrise each day. As the planet orbits and the stars grow farther apart each day, they reach a point where the setting of one coincides with the rising of the other — at which point the planet is in near-constant daytime for about one-quarter of its orbit, or roughly 140 Earth-years.
Is it stable?
According to the study, HD 131399Ab's orbit brings it billions of miles away from its host star. The equivalent in our solar system would be a planet twice as far as Pluto from our sun.
HD 131399Ab also seems to have a tenuous hold on its orbit.
"If the planet was further away from the most massive star in the system, it would be kicked out of the system," Daniel Apai, a co-author of the study said in a statement.
Apai added that computer simulations show that this world could have been kicked out of its orbit if the star system changed just slightly.
Even still, it isn't a sure thing that the world will be in a stable orbit forever.
"It is not clear that the planet's orbit is stable over long periods of time, so it might be that we are catching this system in a special state in which the planet hasn't yet been ejected from the system,"
The planet and its stars are also unique in its own right,
"This system is surprising in that it is a planet found in a stellar system containing three stars, and in which all three stars exert a strong gravitational influence on the planet."
How to photograph a planet
HD 131399Ab was discovered with the Very Large Telescope in Chile by taking photos of the star system in infrared light.
Most methods for finding exoplanets — planets outside of our solar system — are more indirect, either hinging upon detecting minute dips in a star's light as a planet moves across its face, or watching for a "wobble" in a star produced by the gravitational tug of a large planet.
But this world was found using a "direct imaging" technique, which lets scientists literally "take a picture of a planetary system and study the light emerging from an exoplanet independent of its host star," Johnson said.
"High-contrast imaging surveys like this one are the only means of discovering planets in wide orbits around their stars, where wide is further away from the central star than Saturn is from the sun," Johnson added.
This world isn't the only planet found in multi-star systems.
Scientists have also found exoplanets in star systems boast two stars — colloquially known as "Tatooine" planets after Luke Skywalker's home world in Star Wars — and other planets have been found in three-star systems.
Researchers are particularly interested in learning more about these kinds of planetary systems to figure out exactly how uncommon they are.
"I think the next step is a dedicated imaging survey around multi-star systems to see if this type of system is a class of astronomical objects, or an aberration," Johnson said.
https://www.youtube.com/watch?v=OM22kY4SguM
http://science.sciencemag.org/…/…/2016/07/06/science.aaf9671
http://www.nasa.gov/…/20…/newly-discovered-planet-has-3-suns
http://mashable.com/…/alien-planet-found-in-three-star-sy…/…
http://www.eurekalert.org/pub_rel…/2016-07/uoa-ndp070116.php
http://mashable.com/2012/10/16/ph1-tatooine-planet/…

Cecile G. Tamura

கடிதம். . .



ஒரு கடிதத்தை எளிதாக
எழுதத் தொடங்கி விடுகிறார்கள்

நிறைய கடிதங்களை வாசித்திருக்கிறேன்
பிறர்
பிறருக்கு எழுதிய கடிதங்களை
நண்பர் நண்பருக்கு எழுதிய கடிதங்களை
எழுத்தாளர் வாசகருக்கு எழுதிய கடிதங்களை
வாசகர் எழுத்தாளருக்கு எழுதிய கடிதங்களை

ஒரு
தூக்குத் தண்டனை கைதி
அவனுடைய தாய்க்கு எழுதிய கடிதங்களையும்
வாசித்திருக்கிறேன்
மட்டுமல்லாமல்
ஒரு கடிதம்
எவ்வாறு எழுதப்பட வேண்டுமெனச் சொல்கின்ற
நூல்களையும் வாசித்திருக்கிறேன்

என்றாலும்கூட
என்
அன்புக்குரியவருக்கு
எழுத வேண்டிய ஒரு கடிதத்தை
எவ்வாறு தொடங்க வேண்டுமென்பதை
அறியாமல் இருக்கிறேன்
அறிந்துகொள்ள விரும்பாமலும் இருக்கிறேன்.

Sakthi Jothi

Who Invented the Light Bulb?


Cecile G. Tamura
Thomas Edison is usually credited with the invention of the light bulb, but the famous American inventor wasn't the only one who contributed to the development of this revolutionary technology. Many notable figures are also remembered for their work with electric batteries, lamps and the creation of the first incandescent bulbs.
Early research & developments


The story of the light bulb begins long before Edison patented the first commercially successful bulb in 1879. In 1800, Italian inventor Alessandro Volta developed the first practical method of generating electricity, the voltaic pile. Made of alternating discs of zinc and copper — interspersed with layers of cardboards soaked in salt water — the pile conducted electricity when a copper wire was connected at either end. While actually a predecessor of the modern battery, Volta's glowing copper wire is also considered to be one of the earliest manifestations of incandescent lighting.
Not long after Volta presented his discovery of a continuous source of electricity to the Royal Society in London, an English inventor named Humphrey Davy produced the world's first electric lamp by connecting voltaic piles to charcoal electrodes. Davy's 1802 invention was known as an electric arc lamp, named for the bright arc of light emitted between its two carbon rods.
While Davy's arc lamp was certainly an improvement on Volta's stand-alone piles, it still wasn't a very practical source of lighting. This rudimentary lamp burned out quickly and was much too bright for use in a home or workspace. But the principles behind Davy's arc light were used throughout the 1800s in the development of many other electric lamps and bulbs.
In 1840, British scientist Warren de la Rue developed an efficiently designed light bulb using a coiled platinum filament in place of copper, but the high cost of platinum kept the bulb from becoming a commercial success. And in 1848, Englishman William Staite improved the longevity of conventional arc lamps by developing a clockwork mechanism that regulated the movement of the lamps' quick-to-erode carbon rods. But the cost of the batteries used to power Staite's lamps put a damper on the inventor's commercial ventures.
Joseph Swan
In 1850, English chemist Joseph Swan solved the cost-effectiveness problem of previous inventors by developing a light bulb that used carbonized paper filaments in place of ones made of platinum. Like earlier renditions of the light bulb, Swan's filaments were placed in a vacuum tube to minimize their exposure to oxygen, extending their lifespan. Unfortunately for Swan, the vacuum pumps of his day were not efficient as they are now, and his first prototype for a cost-effective bulb never went to market.
While Swan waited for the development of quality vacuum pumps, an American inventor, Charles Francis Brush, was busy developing an electric arc lighting system that would eventually be adopted throughout the United States and Europe during the 1880s. While not truly a light bulb, Brush's lighting systems could be used wherever bright lights were needed — such as in streetlights and inside commercial buildings. To power his systems, Brush developed dynamos — or electric generators — similar to those used that would one day be used to power Edison's electric lamps.
In 1874, Canadian inventors Henry Woodward and Matthew Evans filed a patent for an electric lamp with different-sized carbon rods held between electrodes in a glass cylinder filled with nitrogen. The pair tried, unsuccessfully, to commercialize their lamps but eventually sold their patent to Edison in 1879.
The first practical incandescent light bulb
Edison and his team of researchers in Edison's laboratory in Menlo Park, N.J., tested more than 3,000 designs for bulbs between 1878 and 1880. In November 1879, Edison filed a patent for an electric lamp with a carbon filament. The patent listed several materials that might be used for the filament, including cotton, linen and wood. Edison spent the next year finding the perfect filament for his new bulb, testing more than 6,000 plants to determine which material would burn the longest.
Several months after the 1879 patent was granted, Edison and his team discovered that a carbonized bamboo filament could burn for more than 1,200 hours. Bamboo was used for the filaments in Edison's bulbs until it began to be replaced by longer-lasting materials in the 1880s and early 1900s.
In 1882, Lewis Howard Latimer, one of Edison's researchers, patented a more efficient way of manufacturing carbon filaments. And in 1903, Willis R. Whitney invented a treatment for these filaments that allowed them to burn bright without darkening the insides of their glass bulbs.
Tungsten filaments
William David Coolidge, an American physicist with General Electric, improved the company's method of manufacturing tungsten filaments in 1910. Tungsten, which has the highest melting point of any chemical element, was known by Edison to be an excellent material for light bulb filaments, but the machinery needed to produce super-fine tungsten wire was not available in the late nineteenth century. Tungsten is still the primary material used in incandescent bulb filaments today.
The success of Edison's light bulb was followed by the founding of the Edison Electric Illuminating Company of New York in 1880. The company was started with financial contributions from J.P. Morgan and other wealthy investors of the time. The company constructed the first electrical generating stations that would power electrical system and newly patented bulbs. The first generating station was opened in September 1882 on Pearl Street in lower Manhattan.
Changing technology
Today, lighting choices have expanded and people can choose different types of light bulbs, including compact fluorescent (CFL) bulbs work by heating a gas that produces ultraviolet light and LED bulbs use solid-state light-emitting diodes. 

Sir Joseph Wilson Swan, D.Sc.h.c., FRS (31 October 1828 – 27 May 1914) was a British physicist and chemist. He is most famous for his role in the development of the first incandescent light bulb.

Swan first demonstrated the light bulb at a lecture in Newcastle upon Tyne on 18 December 1878, but he did not receive a patent until 27 November 1880 (patent No. 4933) after improvement to the original lamp. His house (in Gateshead, England) was the first in the world to be lit by lightbulb, and the world's first electric-light illumination in a public building was for a lecture Swan gave in 1880. In 1881, the Savoy Theatre in the City of Westminster, London, was lit by Swan incandescent lightbulbs, the first theatre and the first public building in the world to be lit entirely by electricity.
http://www.livescience.com/43424-who-invented-the-light-bul…
https://www.youtube.com/watch…
http://www.wired.com/2009/12/1218joseph-swan-electric-bulb/