why is a group of fish called a 'school' ?

Some fish tend to swim in groups in order to protect themselves from their predators. the collective noun which denotes such a group depends on the species of the fish in the group,as exemplified by the terms a troop of dogfish.,a swarm of eelsand and a glide of flting fish. the most common collective nouns for a group of fish in general are school and shoal. both the words have evolved from the same common Dutch root schole meaning a troop or crowd.collected fromtimesofindiadaily.

why are video games so additive?

Reasarchers belive kids and adults stay glued to video games because the fun of playing actually is rooted in fulfilling their basic psychological needs.we think there's deeper theory than the fun of playing says richard ryan a motivational psychologist at the university and lead investigating in the four new studies about gaming. they found that games can provide opportuities for achievement,freedom, and even a connection to other player truped a shallow sense of fun which doesnot keep players as interested.

be cautious brain tumour is infectious

if u have four or more siblings then it's better u get your brain scanned,for a new study has found that the number of your brothers or sisters,can trigger your chances of developing a brain tumour. the brain tumour rates were higher among people with younger siblings and not older siblings also caused the researchers to suggest that infections or re-infections in late childhood may play an important role in causing the disease while exposure to infections in infancy.

be cautious -now lie detector is in your computer only

A new lie detector software from Israel says it can show you -across the internet.a user of the lie detector needs to talk for 15 seconds to calibrate their voice,then sound waves start to peak if stress levels are high,a light flashes from green to red and a needle jumps on a scale.the lie dtector however warns users when they are being monitored to avoid legal problems said alex rosenbaum of kishkish.co company. now the further attempt to stretch the possibilities of their of internet ,and for now-like many internet start ups-it offers the product for free through net.

Coming back of electric car

US auto giant GM company again with electric car with new concept. the chevrolet volt will draw power execlusively from a next generation battery pack recharged by a small onboard engine.
the volt is designed to run for 40 miles on pure electric power ,making it ideal for every day family use.the volt's combustion engine is designed only as a supplement to keep its batteries charged.
the volt should be ready for production around the same time the lithium ion batteries will be ,which GM expects to be in two to three years.

Now alcohol become medicine for artritis

Drinking a moderat amount of alcohol each day could protect against arthritis a study on mice but it is applicable to humans as well.
artritis ,a disease of the joints, is the leading cause of disability in people over the age of 65.earlier studies have found that low or moderate alcohol intake benefit people in number of ways ,such as lowering the risk of heart disease. however,it is also well known that drinking too much causes complications.
in the new study ,researchers gave mice injections of collagen, aprotein to induce rhematoid arthirtis, reported the online edition of BBC news

water in mars

A spacecraft orbiting Mars hasscanned huge deposits of ice atA .Lits south pole so plentiful theywould blanket the planet in 36 feetof water if they were liquid,scientists said on Thursday.The scientists used the joint NASA-Italian Space Agency radar instrument on the European Space Agency (ESA) Mars Express spacecraft to gauge the thickness and volume of ice deposits at the Martian south pole.The deposits, up to 2.3 miles thick, are under a polar cap of white frozen carbon dioxide and water — and appear to be composed of at least 90 per cent frozen water, with dust mixed in, according to findings published in the journal Science.Scientists have known that water exists in frozen form at the Martian poles, but this research produced the most accurate measurements of just how much there is.They are eager to learn about the history of water on Mars because water is fundamental to the question of whether the planet hasever harboured microbial, or some other life. Liquid water is a necessity for life as we know it.Characteristics like channels on the Martian surface strongly suggest the planet was once very wet; a contrast to its present arid, dusty condition.Jeffrey Plaut of NASA’s Jet Propulsion Laboratory in California, who led the study, said the same techniques are being used to examine similar ice deposits at the Martian north pole.Radar observations made in late 2005 and early 2006 provided the data on the south pole, and similarobservations were taken of the north pole in the past several months, Plaut said.Plaut, part of an international team of two dozen scientists, said a preliminary look at this dataindicated the ice deposits in at the north pole are comparable to those at the south pole.SEARCH FOR LIFE“Life as we know it requires waterand, in fact, at least transient liquid water for cells to survive and reproduce. So if we are expecting to find life on Mars we need to go to a location where water is available,” Plaut said.“So the polar regions are naturally a target because we certainly know that there’s plenty of H20 there.”Some of the new information even hints at the possible existence of a thin layer of liquid water at the base of the deposits.But while images taken byNASA’s Mars Global Surveyor spacecraft made public in December suggested the presence of a small amount of liquid water on the surface, researchers are baffled about the fate of most of the water. The polar deposits contain most of the known water on Mars.Plaut said the amount of water in the Martian past may have been the equivalent of a global layer hundreds of metres deep, while the polar deposits represent a layer of perhaps tens of metres.“We have this continuing question facing us in studies of Mars, which is: Where did all the water go?” Plaut said.“Even if you took the water in these two (polar) ice caps and added it all up, it’s still not nearly enough to do all of the work that we’ve seen that the water has done across the surface of Mars in its history.”Plaut said it appears perhaps 10 per cent of the water that once existed on Mars is now trapped in these polar deposits. Other water may exist below the planet’s surface or perhaps some was lost into space through the atmosphere, Plaut said.REUTERSWATER ON MARSScientists have found large deposits of ice on the south pole of Mars; enough to blanket the entire planet in water if it was in liquid form...This map shows the ice-rich south pole of Mars that was probed by the MARSIS radar equipment on the ESA’s Mars Express Orbiter. The thickness of the ice was determined by measuring the time delay between radar echoes from the surface and those from the “bed” of the deposits The radar data indicates that the deposit is more than 3.7 kilometres thick in places, and that the material consists of nearly pure water ice with only a small component of dust