-
IT KEEPS GOING AND GOING AND GOING DEPARTMENT -
Turning Physics on its Ear
Physicists around the world are excitedly awaiting the start up of the £4.65 billion Large Hadron Collider, LHC - the most powerful atom-smasher ever built - which is supposed to shed new light on the particles and forces at work in the cosmos and reproduce conditions that date to near the Big Bang of creation.
Prof Irina Aref'eva and Dr Igor Volovich, mathematical physicists at the Steklov Mathematical Institute in Moscow believe that the vast experiment at CERN, the European particle physics centre near Geneva in Switzerland, may turn out to be the world's first time machine, reports New Scientist.
The debut in early summer could provide a landmark because traveling into the past is only possible - if it is possible at all - as far back as the point of creation of the first time machine. That means 2008 could become "Year Zero" for temporal travel, they argue.
Time travel was born when Albert Einstein's colleague, Kurt Gödel, used Einstein's theory of relativity to show that travel into the past was possible.
Ever since he unveiled this idea in 1949, eminent physicists have argued against time travel because it undermines ideas of cause and effect to create paradoxes: a time traveller could go back to kill his grandfather so that he is never born in the first place.
But, sixty years later, there is still no fundamental reason why time travellers cannot put historians out of business.
But the Russians argue that when the energies of the LHC are concentrated into a subatomic particle - a trillionth the size of a mosquito - they can do strange things to the fabric of the universe, which is a blend of space and time that scientists called spacetime.
While Earth's gravity produces gentle distortions in spacetime the LHC energy can distort time so much that it loops back on itself. These loops are known to physicists as "closed timelike curves" and they ought, at least in theory, to allow us to revisit some past moment.
The scheme chimes with one laid out in 1988, when Prof Kip Thorne and colleagues at the California Institute of Technology, Pasadena, showed that wormholes, or tunnels through spacetime, would allow time travel, a scheme popularised by Carl Sagan in his novel - made into a film - Contact.
Prof Aref'eva and Dr Volovich believe the LHC could create wormholes and so allow a form of time travel. "We realised that closed timelike curves and wormholes could also be a result of collisions of particles," Prof Aref'eva says.
There are still plenty of obstacles for the likes of Dr Who, however. Not least of them is the fact that these are mini wormholes, so only subatomic particles are small enough to travel through them.
They say that whether subatomic time travel in the LHC would open the doors for human scale time travelers "is a deep and interesting question" but stress that "these problems, and many others as well, require further investigations."
Probably the best we can hope for is that the LHC may show a signature of the wormholes' existence, Dr Volovich says. If some of the energy from collisions in the LHC goes missing, it could be because the collisions created particles that have traveled into a wormhole and through time.
One sticking point until now for wormhole concepts is finding an exotic kind of material capable of keeping the maw of the wormhole open for time travel.
Dark energy - a mysterious antigravity force that is thought to pervade the universe - could, they say, be just what is needed to keep the entrance to a wormhole open, at least according to one family of ideas about its nature, where it is called phantom energy.
If a blend of colliding particles and phantom energy does create a wormhole in Geneva this year, an advanced civilisation could find it in their history books, pinpoint the moment, and take advantage of their technology to pay us a visit.
"The observational evidence still allows for phantom energy," says Robert Caldwell, a physicist at Dartmouth College in Hanover, New Hampshire. "As for Aref'eva and Volovich's speculation that the LHC will produce the stuff of time machines - ugh!"
A leading scientist who believes that time travel may be possible, Prof David Deutsch of Oxford University, comments: "It's speculative in the extreme, but not cranky. For various reasons I don't think the mechanism they propose would work (i.e. provide a pathway for messages from the future) even if their speculations are true."
Dr Brian Cox of the University of Manchester adds: "The energies of billions of cosmic rays that have been hitting the Earth's atmosphere for five billion years far exceed those we will create at the LHC, so by this logic time travelers should be here already. If these wormholes appear I will personally eat the hat I was given for my first birthday before I received it."
Source: The Telegraph
http://www.telegraph.co.uk/earth/main.jhtml?view=DETAILS&grid=&xml=/
earth/2008/02/06/scitime106.xml
Turning Physics on its Ear
Has college dropout done the
impossible and created a perpetual motion machine?
Thane Heins is nervous and hopeful. It's Jan. 24, a Thursday afternoon, and in four days the Ottawa-area native will travel to Boston where he'll demonstrate an invention that appears – though he doesn't dare say it – to operate as a perpetual motion machine.
The audience, esteemed Massachusetts Institute of Technology professor Markus Zahn, could either deflate Heins' heretical claims or add momentum to a 20-year obsession that has broken up his marriage and lost him custody of his two young daughters.
Zahn is a leading expert on electromagnetic and electronic systems. In a rare move for any reputable academic, he has agreed to give Heins' creation an open-minded look rather than greet it with outright dismissal.
It's a pivotal moment. The invention, at its very least, could moderately improve the efficiency of induction motors, used in everything from electric cars to ceiling fans. At best it means a way of tapping the mysterious powers of electromagnetic fields to produce more work out of less effort, seemingly creating electricity from nothing.
Such an unbelievable invention would challenge the laws of physics, a no-no in the rigid world of serious science. Imagine a battery system in an all-electric car that can be recharged almost exclusively by braking and accelerating, or what Heins calls "regenerative acceleration."
No charging from the grid. No assistance from gasoline. No cost of fuelling up. No way, say the skeptics.
"It sounds too good to be true," concedes Heins, who formed a company in 2005 called Potential Difference Inc. to develop and market his invention. "We get dismissed pretty quickly sometimes."
It's for this reason the 46-year-old inventor has learned to walk on thin ice when dealing with academics and engineers, who he must win over to be taken seriously. Credibility, after all, can't be invented. It must be earned. "I have to be humble. If you say the wrong thing at the wrong time, you can lose support."
The creation in question is a new kind of generator called the Perepiteia, which in Greek theatre means an action that has the opposite effect of what its doer intended. Heins torques up the definition to mean "a sudden reversal of fortune that's a windfall for humanity."
Deep down, Heins has high hopes. But he also realizes that merely using those controversial words – "perpetual motion" – usually brands a person as batty. In 2006, an Irish company called Steorn placed an advertisement in The Economist calling on all the world's scientists to validate its magnet-based "free energy" technology.
Steorn was met with intense skepticism and accused of being a scam or hoax. Seventeen months later the company has failed, despite worldwide attention, to prove anything under scrutiny. Well-educated people, from Leonardo da Vinci to Harvard-trained engineer Bruce De Palma (older brother of film director Brian De Palma), have made similar claims of perpetual motion only to be slammed down by the mainstream scientific community.
Heins has an even greater uphill battle. He isn't an engineer. He doesn't have a graduate degrees in physics. He never even finished his electronics program at Heritage College in Gatineau, Quebec. "I have mild dyslexia and don't do well in math, so I didn't do very well in school," he says.
What he does have is a chef's diploma, and spent time as chef at the Canadian Museum of Civilization before launching his own restaurant in Renfrew called the Old Town Hall Tea Room. He has also had political ambitions. In 1999 he ran unsuccessfully as a candidate for the Green Party of Ontario, deciding a year later to run as an independent in the federal election.
Today, Heins is focused on showing his invention to anybody willing to see it, in hopes that somebody smarter than him will give it credibility. His long-time friend, Kim Cunningham, manager of communications and government relations at the Ottawa Centre for Research and Innovation (OCRI) is working part-time with Potential Difference to help get the message out.
Together, they have demonstrated the Perepiteia to a number of labs and universities across North America, including the University of Virginia, Michigan State University, the University of Toronto and Queens University.
"It's generally always the same reaction," says Heins. "There's a bit of a scramble on the part of the observer to put what they're seeing into some sort of context with what they know. They can't explain it. They don't know what it is."
He'd be happy if somebody did, even if the news was bad. His wife has kicked him out. He doesn't earn an income. He can't pay child support. The certainty would be welcome. "I've tried to quit many times, and thought if I could just be a normal guy I would have a normal life ... But I had this idea and I believe it works."
Others want to believe – or at least help out. Cunningham, whose brother is general manager at Angus Glen Golf Club, introduced Heins to the club's president, Kevin Thistle. For two years Thistle has acted as angel investor, providing start-up capital needed to incorporate Potential Difference, file patents and continue research.
Cunningham's boss, OCRI president Jeffrey Dale, helped open doors at the University of Ottawa and make introductions to its dean of engineering. As a result, Heins teamed up last fall with Riadh Habash, a professor at the university's school of information technology and engineering.
"Dr. Habash has essentially rolled out the red carpet," says Heins, explaining that he now has access to a university lab and all the equipment he needs to test and simulate his generator.
In an interview with the Toronto Star, Habash was cautious but matter-of-fact with what he's seen so far. "It accelerates, but when it comes to an explanation, there is no backing theory for it. That's why we're consulting MIT. But at this time we can't support any claim."
In the meantime, Heins has been on a letter-writing campaign to raise money for his mission. He's written former U.S. vice-president Al Gore, Virgin Group founder and billionaire Richard Branson and John Doerr at venture capital powerhouse Kleiner Perkins Caufield & Byers. He's also tried to contact entrepreneur Elon Musk, chairman of electric car upstart Tesla Motors, and the "ReCharge IT" project run by Google's philanthropic arm.
So far no bites, though there have been nibbles. Heins has had discussions with a well-known investor in Oregon, known to many as the "godfather of start-ups," who is apparently flirting with the idea of investing in Potential Difference. "We got the impression ... he's not necessarily interested in making a tonne of money, he just wants to see us succeed."
Just before the big day at MIT, the Star spoke with professor Markus Zahn about what he expected to observe.
"It's hard for me to give an opinion," said Zahn, who admitted he was excited to see the demonstration. "I don't believe it will violate the laws of physics. You're not going to get more energy out than you put in."
He said it's easy for people to set up their tests wrong and misinterpret what they see. "You've got to look closely."
It's now Jan. 28 – D Day. Heins has modified his test so the effects observed are difficult to deny. He holds a permanent magnet a few centimetres away from the driveshaft of an electric motor, and the magnetic field it creates causes the motor to accelerate. It went well.
Contacted by phone a few hours after the test, Zahn is genuinely stumped – and surprised. He said the magnet shouldn't cause acceleration. "It's an unusual phenomena I wouldn't have predicted in advance. But I saw it. It's real. Now I'm just trying to figure it out."
There's no talk of perpetual motion. No whisper of broken scientific laws or free energy. Zahn would never go there – at least not yet. But he does see the potential for making electric motors more efficient, and this itself is no small feat.
"To my mind this is unexpected and new, and it's worth exploring all the possible advantages once you're convinced it's a real effect," he added. "There are an infinite number of induction machines in people's homes and everywhere around the world. If you could make them more efficient, cumulatively, it could make a big difference."
Driving home – he can't afford to fly – Heins is exhausted but encouraged. He says Zahn will, and must, evaluate what he saw on his own terms and time. What's preventing the engineer from grasping it right away, he says, is his education, his scientific training.
Step by step, Heins is making progress, but where it will all lead remains uncertain.
Source: The Toronto Star
http://www.thestar.com/Business/article/300042
Thane Heins is nervous and hopeful. It's Jan. 24, a Thursday afternoon, and in four days the Ottawa-area native will travel to Boston where he'll demonstrate an invention that appears – though he doesn't dare say it – to operate as a perpetual motion machine.
The audience, esteemed Massachusetts Institute of Technology professor Markus Zahn, could either deflate Heins' heretical claims or add momentum to a 20-year obsession that has broken up his marriage and lost him custody of his two young daughters.
Zahn is a leading expert on electromagnetic and electronic systems. In a rare move for any reputable academic, he has agreed to give Heins' creation an open-minded look rather than greet it with outright dismissal.
It's a pivotal moment. The invention, at its very least, could moderately improve the efficiency of induction motors, used in everything from electric cars to ceiling fans. At best it means a way of tapping the mysterious powers of electromagnetic fields to produce more work out of less effort, seemingly creating electricity from nothing.
Such an unbelievable invention would challenge the laws of physics, a no-no in the rigid world of serious science. Imagine a battery system in an all-electric car that can be recharged almost exclusively by braking and accelerating, or what Heins calls "regenerative acceleration."
No charging from the grid. No assistance from gasoline. No cost of fuelling up. No way, say the skeptics.
"It sounds too good to be true," concedes Heins, who formed a company in 2005 called Potential Difference Inc. to develop and market his invention. "We get dismissed pretty quickly sometimes."
It's for this reason the 46-year-old inventor has learned to walk on thin ice when dealing with academics and engineers, who he must win over to be taken seriously. Credibility, after all, can't be invented. It must be earned. "I have to be humble. If you say the wrong thing at the wrong time, you can lose support."
The creation in question is a new kind of generator called the Perepiteia, which in Greek theatre means an action that has the opposite effect of what its doer intended. Heins torques up the definition to mean "a sudden reversal of fortune that's a windfall for humanity."
Deep down, Heins has high hopes. But he also realizes that merely using those controversial words – "perpetual motion" – usually brands a person as batty. In 2006, an Irish company called Steorn placed an advertisement in The Economist calling on all the world's scientists to validate its magnet-based "free energy" technology.
Steorn was met with intense skepticism and accused of being a scam or hoax. Seventeen months later the company has failed, despite worldwide attention, to prove anything under scrutiny. Well-educated people, from Leonardo da Vinci to Harvard-trained engineer Bruce De Palma (older brother of film director Brian De Palma), have made similar claims of perpetual motion only to be slammed down by the mainstream scientific community.
Heins has an even greater uphill battle. He isn't an engineer. He doesn't have a graduate degrees in physics. He never even finished his electronics program at Heritage College in Gatineau, Quebec. "I have mild dyslexia and don't do well in math, so I didn't do very well in school," he says.
What he does have is a chef's diploma, and spent time as chef at the Canadian Museum of Civilization before launching his own restaurant in Renfrew called the Old Town Hall Tea Room. He has also had political ambitions. In 1999 he ran unsuccessfully as a candidate for the Green Party of Ontario, deciding a year later to run as an independent in the federal election.
Today, Heins is focused on showing his invention to anybody willing to see it, in hopes that somebody smarter than him will give it credibility. His long-time friend, Kim Cunningham, manager of communications and government relations at the Ottawa Centre for Research and Innovation (OCRI) is working part-time with Potential Difference to help get the message out.
Together, they have demonstrated the Perepiteia to a number of labs and universities across North America, including the University of Virginia, Michigan State University, the University of Toronto and Queens University.
"It's generally always the same reaction," says Heins. "There's a bit of a scramble on the part of the observer to put what they're seeing into some sort of context with what they know. They can't explain it. They don't know what it is."
He'd be happy if somebody did, even if the news was bad. His wife has kicked him out. He doesn't earn an income. He can't pay child support. The certainty would be welcome. "I've tried to quit many times, and thought if I could just be a normal guy I would have a normal life ... But I had this idea and I believe it works."
Others want to believe – or at least help out. Cunningham, whose brother is general manager at Angus Glen Golf Club, introduced Heins to the club's president, Kevin Thistle. For two years Thistle has acted as angel investor, providing start-up capital needed to incorporate Potential Difference, file patents and continue research.
Cunningham's boss, OCRI president Jeffrey Dale, helped open doors at the University of Ottawa and make introductions to its dean of engineering. As a result, Heins teamed up last fall with Riadh Habash, a professor at the university's school of information technology and engineering.
"Dr. Habash has essentially rolled out the red carpet," says Heins, explaining that he now has access to a university lab and all the equipment he needs to test and simulate his generator.
In an interview with the Toronto Star, Habash was cautious but matter-of-fact with what he's seen so far. "It accelerates, but when it comes to an explanation, there is no backing theory for it. That's why we're consulting MIT. But at this time we can't support any claim."
In the meantime, Heins has been on a letter-writing campaign to raise money for his mission. He's written former U.S. vice-president Al Gore, Virgin Group founder and billionaire Richard Branson and John Doerr at venture capital powerhouse Kleiner Perkins Caufield & Byers. He's also tried to contact entrepreneur Elon Musk, chairman of electric car upstart Tesla Motors, and the "ReCharge IT" project run by Google's philanthropic arm.
So far no bites, though there have been nibbles. Heins has had discussions with a well-known investor in Oregon, known to many as the "godfather of start-ups," who is apparently flirting with the idea of investing in Potential Difference. "We got the impression ... he's not necessarily interested in making a tonne of money, he just wants to see us succeed."
Just before the big day at MIT, the Star spoke with professor Markus Zahn about what he expected to observe.
"It's hard for me to give an opinion," said Zahn, who admitted he was excited to see the demonstration. "I don't believe it will violate the laws of physics. You're not going to get more energy out than you put in."
He said it's easy for people to set up their tests wrong and misinterpret what they see. "You've got to look closely."
It's now Jan. 28 – D Day. Heins has modified his test so the effects observed are difficult to deny. He holds a permanent magnet a few centimetres away from the driveshaft of an electric motor, and the magnetic field it creates causes the motor to accelerate. It went well.
Contacted by phone a few hours after the test, Zahn is genuinely stumped – and surprised. He said the magnet shouldn't cause acceleration. "It's an unusual phenomena I wouldn't have predicted in advance. But I saw it. It's real. Now I'm just trying to figure it out."
There's no talk of perpetual motion. No whisper of broken scientific laws or free energy. Zahn would never go there – at least not yet. But he does see the potential for making electric motors more efficient, and this itself is no small feat.
"To my mind this is unexpected and new, and it's worth exploring all the possible advantages once you're convinced it's a real effect," he added. "There are an infinite number of induction machines in people's homes and everywhere around the world. If you could make them more efficient, cumulatively, it could make a big difference."
Driving home – he can't afford to fly – Heins is exhausted but encouraged. He says Zahn will, and must, evaluate what he saw on his own terms and time. What's preventing the engineer from grasping it right away, he says, is his education, his scientific training.
Step by step, Heins is making progress, but where it will all lead remains uncertain.
Source: The Toronto Star
http://www.thestar.com/Business/article/300042
-
GONNA GO BACK IN TIME DEPARTMENT -
Time Travellers From the Future "Could Be Here in Weeks"
Time Travellers From the Future "Could Be Here in Weeks"
Physicists around the world are excitedly awaiting the start up of the £4.65 billion Large Hadron Collider, LHC - the most powerful atom-smasher ever built - which is supposed to shed new light on the particles and forces at work in the cosmos and reproduce conditions that date to near the Big Bang of creation.
Prof Irina Aref'eva and Dr Igor Volovich, mathematical physicists at the Steklov Mathematical Institute in Moscow believe that the vast experiment at CERN, the European particle physics centre near Geneva in Switzerland, may turn out to be the world's first time machine, reports New Scientist.
The debut in early summer could provide a landmark because traveling into the past is only possible - if it is possible at all - as far back as the point of creation of the first time machine. That means 2008 could become "Year Zero" for temporal travel, they argue.
Time travel was born when Albert Einstein's colleague, Kurt Gödel, used Einstein's theory of relativity to show that travel into the past was possible.
Ever since he unveiled this idea in 1949, eminent physicists have argued against time travel because it undermines ideas of cause and effect to create paradoxes: a time traveller could go back to kill his grandfather so that he is never born in the first place.
But, sixty years later, there is still no fundamental reason why time travellers cannot put historians out of business.
But the Russians argue that when the energies of the LHC are concentrated into a subatomic particle - a trillionth the size of a mosquito - they can do strange things to the fabric of the universe, which is a blend of space and time that scientists called spacetime.
While Earth's gravity produces gentle distortions in spacetime the LHC energy can distort time so much that it loops back on itself. These loops are known to physicists as "closed timelike curves" and they ought, at least in theory, to allow us to revisit some past moment.
The scheme chimes with one laid out in 1988, when Prof Kip Thorne and colleagues at the California Institute of Technology, Pasadena, showed that wormholes, or tunnels through spacetime, would allow time travel, a scheme popularised by Carl Sagan in his novel - made into a film - Contact.
Prof Aref'eva and Dr Volovich believe the LHC could create wormholes and so allow a form of time travel. "We realised that closed timelike curves and wormholes could also be a result of collisions of particles," Prof Aref'eva says.
There are still plenty of obstacles for the likes of Dr Who, however. Not least of them is the fact that these are mini wormholes, so only subatomic particles are small enough to travel through them.
They say that whether subatomic time travel in the LHC would open the doors for human scale time travelers "is a deep and interesting question" but stress that "these problems, and many others as well, require further investigations."
Probably the best we can hope for is that the LHC may show a signature of the wormholes' existence, Dr Volovich says. If some of the energy from collisions in the LHC goes missing, it could be because the collisions created particles that have traveled into a wormhole and through time.
One sticking point until now for wormhole concepts is finding an exotic kind of material capable of keeping the maw of the wormhole open for time travel.
Dark energy - a mysterious antigravity force that is thought to pervade the universe - could, they say, be just what is needed to keep the entrance to a wormhole open, at least according to one family of ideas about its nature, where it is called phantom energy.
If a blend of colliding particles and phantom energy does create a wormhole in Geneva this year, an advanced civilisation could find it in their history books, pinpoint the moment, and take advantage of their technology to pay us a visit.
"The observational evidence still allows for phantom energy," says Robert Caldwell, a physicist at Dartmouth College in Hanover, New Hampshire. "As for Aref'eva and Volovich's speculation that the LHC will produce the stuff of time machines - ugh!"
A leading scientist who believes that time travel may be possible, Prof David Deutsch of Oxford University, comments: "It's speculative in the extreme, but not cranky. For various reasons I don't think the mechanism they propose would work (i.e. provide a pathway for messages from the future) even if their speculations are true."
Dr Brian Cox of the University of Manchester adds: "The energies of billions of cosmic rays that have been hitting the Earth's atmosphere for five billion years far exceed those we will create at the LHC, so by this logic time travelers should be here already. If these wormholes appear I will personally eat the hat I was given for my first birthday before I received it."
Source: The Telegraph
http://www.telegraph.co.uk/earth/main.jhtml?view=DETAILS&grid=&xml=/
earth/2008/02/06/scitime106.xml
-
SHOCKING MYSTERIES DEPARTMENT -
Electricity Woman Causes Lights to Flicker
Electricity Woman Causes Lights to Flicker
The ability to control electricity with your mind may seem the stuff of science fiction. But one woman claims such a power is part of her everyday reality.
Debbie Wolf says she is one of Britain's growing number of "sliders" - people who believe their presence interferes with household appliances, radios and light bulbs. She claims she can turn street lamps off, send digital clocks haywire and even defrost her freezer.
Debbie claims she is one of Britain's growing army of 'sliders' - people who believe their presence causes havoc with household appliances, radios and light bulbs
But 38-year-old Miss Wolf admits that she has no control over her power.
"It happens when I'm stressed or if I'm chewing something over in my mind, but not if I'm annoyed," she said.
"It has never been full on whammy all day, but it happens frequently, such as when I'm excited."
Miss Wolf says she once blew a series of street lamps while riding by on a motorbike. And she uses a wind-up alarm clock because her reaction on waking up in the morning "scrambles" digital ones.
Her supposed ability, dubbed Street Light Interference syndrome - or SLI - by experts, has earned her international fame. In Japan, she has been likened to heroines from cult Manga comic strips. She has also been compared to characters from the BBC2 show Heroes - in which ordinary people develop superhero abilities.
Miss Wolf, from Telscombe Cliffs, near Brighton, said: "The light has been faulty outside all the homes I have lived in and I'm always draining the batteries in remote controls.
"I often come back home to find a pool of water on the floor because the fridge-freezer has defrosted."
For a woman who believes she interferes with electrical equipment, however, Miss Wolf has chosen a risky job. But her work as a pathology support officer at the Royal Sussex County Hospital in Brighton has never been affected, she said.
Hilary Evans, who writes about the paranormal and who coined the term "sliders", said Miss Wolf brings about unusually strong effects. Debbie Wolf has an unexplained ability to make lights go out when she is stressed
"What happened to Debbie has happened to a great many other people, though her experience was more dramatic than most," he said.
Sceptics, however, dismiss SLI as wishful thinking and coincidence. It is yet to be demonstrated in a contolled laboratory experiment, they argue.
Professor Richard Wiseman, who studies paranormal phenomena at the University of Hertfordshire, suspects SLI is caused by "observer bias".
He said: "Street lamps are going on and off all the time because they are faulty or because their timers aren't set properly.
"People only have to walk under a couple of lamps going off to think that they might be the cause."
Recently, the Mail put Miss Wolf 's power to the test. Sitting in the hospital canteen, she was given a torch, a mobile phone and a radio on which to use her electrical influence - but none responded to her interference.
The lights in the canteen, the battery-powered clock on the wall and the electric tills also continued to operate normally. But Miss Wolf explained that she has to be in the right mood for her powers to work.
"I have to be completely lost in my thoughts - usually thinking deeply about something that is troubling me."
Source: The Daily Mail
http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_
article_id=511680&in_page_id=1770