I can only assume that they've corrected for General Relativity. Everyone seems to be pointing to the obvious potential sources of error: knowing when the neutrinos are created, knowing when they arrive, knowing the distance that they've traveled.
What about variations in the Earth's gravitational field between the two clocks? Or along the path that the neutrinos follow? You can't call the planet a point-source of gravity - the density of matter is quite lumpy.
I haven't seen a back-of-the-envelope calculation for this...maybe it's orders of magnitudes impossible? Would it require a tiny black hole to throw the timing off by 60ns...or would a big uranium deposit be enough? I could probably do the Lorenz transforms for Special Relativity myself, but General is a bit beyond me.
I punched some numbers into the realitivity calculator and came up with half a millimeter difference in length over 730km with the contribution of the dent in spacetime made by the mass of the earth completely removed therefore any small changes due to local masses are simply irrelevent. The effect is some 200 times greater than the effect of gravitational time dialation on earth.
I used 11.18 km/sec to get the change factor as this is the escape velocity from earth. (Gravitational time dialation is the same as time dialation due to acceleration at escape velocity)
The gamma factor from the calculator is 1:1.000000000695364
Over the distance in kilometers 730:730.00000050761572
In millimeters: 730000000:730000000.50761572
If the earths mass did not dent spacetime at all light would be able to travel an extra.50761572 mm over the 730km distance given the same time.
the history of the PC. How many decades did it take for us to get where we are? The first PC was some 50 years in the making and by today's standards was downright laughable in its capabilities. The first computers weren't Von Neumann machines either. You had to have a team of dedicated operators reconfigure patch cables between between outputs and inputs for each an every calculation! To be so pessimistic so early in the life of quantum computing is insulting to the progress we've made so far which is considerably outstripping the pace of development of the modern computer.
My pessimism is driven by a firm belief there is no free lunch in the universe. There is no perpetual motion. There is no well of infinite computation.
If you think your going to be able to answer questions requiring classic processors having the mass of the sun with a QC having many thousands of entangled qbits in a single coherent system I *believe* this is fantasy.
If your bar is much much lower.. say cost effective QC on desktops which add 1k, 1m or a billion times performance for some classes of problems over what we have now then yes I agree with you this future may well be possible.
In my view a computer a million times more performant is very useful however in the end even while this may seem impressive these sorts of advancements do not hold a candle to the origional promise of QC.
This smells like the same issue openssl patched 10 years ago.
Am I correct in assuming as long as you don't set SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS your good to go and this attack does NOT effect you for SSL 3/TLS1?
If not is there any protocol level information avaliable? The gooblygook in TFA is not particularly helpful.
This is orders of magnitude smaller than what is seen here. The relevant length scale of earth's mass is ~cm, i.e. if all the mass of the earth was concentrated in a black hole it would be the ~cm size and only path length difference on the order of cm would be seen (if you were very close to the black hole's surface). The earth is far from a black hole making the GR corrections much much smaller.
Gravitational time dialation is exactly equal to the time dialation experienced by acceleration to the escape velocity.
It's an easy calculation, and about 3 orders of magnitude (or more) too small.
Without any mass energy pressure on the metric the difference at sea level over the 732km distance is 97 feet or about 100ns faster so you are most likely correct.
Gravity follows inverse square law with distance if you were down far enough underground wouldn't the deformation of the metric be somewhat different due to significant masses below AND above you?
If you compared the underground effect with above ground laser results the true time/path length thru metric is slightly different.
Taking the number of solar panels needed produce roughly 245 watts apiece. Remember that previous number? It's about to get a whole lot bigger. Roughly 10.49 billion watts is the total output. That translates to approximately 7.67 trillion killowat hours per month
While I applaud people who attempt to do the math the average hours of usable sunlight per day is on the order of 4-5hrs when you figure in cloud cover, night time, fog,smog...etc over much of the US.
What really sucks about solar is not the cost of panels. The major problem and cost come from energy storage and distribution. For any significant dent the grid would need to be overhauled or we would need to see dramatic advancements in reliable cost effective energy storage.
Makes sense if it stops the current Russian Roulette of installing a Windows or Android app and praying it's not stuffed to the gills with Malware. This is the primary reason many feel safer with iOS.
There have been a number of malware apps removed from the Apple store *after* successful approval.
Even if Apple had the source code it is not possible to detect intentionally hidden malware the same way it is not possible to detect all security failures in their operating systems and browsers.
MS platform is in the best positionin terms of malware. They do not need to review anything to keep their platform safe. The app and its entire view of the system is completely isolated in its own world. Necessary interactions with the rest of the system such as selecting a stored image are handled by system choosers where data is always copied.
There is no reason they need to lock down the system in this way. They are just being greedy.
Still use File Manager? Or is that too modern for your tastes. Metro is an extremely compelling design language. Your cynical I-hate-everything-I'm-not-into doesn't change this fact
LOL you stated an opinion and then asserted it to be a fact.
It is funny listening to people who make the argument you whine because you just hate change you hate anything new you are not used to and therefore we can afford to simply ignore your criticism.
It is more amusing over the years to watch the backtracking done by MS after they hear the market repeat some of what those same people had been saying all along.
Actually the complete opposite needs to happen. The way the government stopped the smuggling of alcohol and the related gang/mob violence during prohibition was to re-legalize alcohol. Make drugs a legal product and have the government tax the profits. It will immediately stop all this wasteful drug related violence and security expenditure.
I have a better idea. If someone tries to sell you drugs make it legal to shoot them in the head and hang their body from a bridge.
It would not surprise me if he ends up finding more vulnerabilities than the rest of the world combined and he does it exclusivly for fun/challenge.
"Responsible" disclosure does tend to mitigate problems in the real world much like a virus scanner installed on a random desktop.
However neither approach provides the proper incentives to the market to address the root cause of the design/process deficiency which allowed the defect to occur. Responsible disclosure actually artifically lowers the cost the industry has to pay for a security failure only while it is found by someone who is deemed to be "responsible". This makes all software less safe in the long run.
I don't need backwards gimmicky UI concepts that look like total crap (WP7) or apple style lockin hell app stores and I have zero interest of any kind in touching my monitor. It looks gross enough as it is.
If the new UI can't be turned off and I mean turned the hell **off** then no sale.
Progress to me is defined as enabling me to get crap done. Distraction and game playing (not keeping your designers on their leashes) is not progress -- it is a waste of everyones time.
You know what would really be cool is a boost style dimensional analysis system bound to schema meta data. Otherwise is it really necessary to invent a new a new language to introduce strict mode to existing query languages?
With every domain name you own you should be able to get an SSL cert with your registration/renewal. I want to register this domain and here is my CSR as part of the registration process.
CAs were supposed to verify you independantly of domain ownership so that identity problems such as bad actors getting certs for gooogle.com..could not occur.
Today the process has been soo watered down humans are too many cases not even in the loop. All distinction between identity and domains for all practical purposes does not exist.
Give everyone with a domain name their own SSL certs and stop throwing money at CAs. The network will be marginally safer for it.
IMHO all of these products, including motors for hybrid vehicles, are too important to allow China to trivial blackmail the rest of the world at their pleasure. All that is needed is the US government to guarantee purchase at some set price and dozens of new mines would open overnight in the US.
It is non trivial to bring these online. It takes on the order of years but this ball is already rolling.
The chinese might be able to screw the market over in the short run.. over the long haul they are only screwing themselves.
Agreed. I have always had a hard time stomaching the theory that dark matter and dark energy exist. It seems far too much like aether, i.e. something made up to fill a gap in knowledge without much evidence backing it up. "Look, my equations don't work out in every situation. EUREKA! If I just make some shit up like say, invisible matter that doesn't interact with other matter except through gravity, I can make my equations work!". I think its probably that the equations are based on more special cases. Think of the difference between Newtonian and Relativistic models. One works on planetary scale, the other on the level of star systems and near galactic scale, but now we find out our current model doesn't work in every situation such as quantum scale (yes, they've know that for awhile), or on super macro-scale. It must be that the model needs additional generalization rather than inventing magic stuff.
DM and DE are two totally separate ideas. Don't mix the two or attempt to draw the same conclusions with the same brush. Chances are if you do that you will be wrong.
Dark was chosen because we did not know what the heck was responsible for the unexpected **observations**. We could tell there was more esplainin to do but the answer was noowhere to be found.
DE is blatently obvious given astronomer obsession with the hubble constant being critical to understanding evolution of the universe.
DM is much more difficult to see however both effects are very real.
Yes people have invented many **theories** to try and explain both DM and DE. Some were constructed ontop convinent self-referential foundations. They can't all be right..most or all of them will be discarded as more observations and experiments are conducted. This is how the process works. You can make fun of a theory all you want but you don't get the same leeway with observables.
The negative gravity thing is interesting.. it will be tested soon enough. Personally I don't believe for the following reason: During a matter-anti-matter collision what is the gravitational color of the resulting energy produced?
OMFG for months we've been hearing western nations cry bloody murder over Middle eastern government oppresive measures against their own telecom infustructures...
This colminated with the fucking UN declaring Internet access to be a human right.
Now we have ourselves some relatively minor incidents of civil unrest and the very same (mostly european) countries are doing the very same shit they were previously so adamantly against.
Windows machines can be pretty secure on their own too, but once hooked up to an active directory domain they are only as secure as the weakest point...
Just because a windows computer has joined a domain does not mean the domain now has root or for that matter *any* access to the local computer. It is still determined by local policy.
Also, this seems to be a particular authentication scheme which is flawed, windows has similar flawed schemes (google: pass the hash).
Just randomly bias each smart meter or print different peak/off peak times on everyones bills.
Realtime minute by minute rates could actually use feedback from the grid to improve reliability or respond to emergencies where n-1 could otherwise not be achived. You just include grid stability in the cost calculation.
I don't understand what the point of TFA is. It is as if they just discovered if you enter x2 into your calculator and keep pressing = it quickly starts to display larger and larger figures before erroring out.
Depends entirely on the workload. The HD drives will lose if:
a) The working set exceeds 32GB. If the accesses are random, they will lose by 2-3 orders of magnitude.
If the working set exceeds 32GB would you expect the system with only 4GB of memory to have a chance? I'm sure you could think about it for a while and dream up a mythical workload with just the right characteristics to make it work.. for a few hours anyway until all the oxide on the flash gates is gone.
8GB ram = $50.
b) Whenever there is a need to commit or sync the writes to disk. On a normal system, that will happen every few seconds. If you disable that, your reliability argument is gone
I was thinking more in terms of storage reliability. When SSDs fail they more often fail specatucularly with no warning. RAID0 is less reliable than single disk. A failure of any disk means the entire array is unusable.
In terms of flush I would never advocate disabling writes to persistant storage under any circumstance. A performant system would coalesce as many operations into a transaction as reasonable to minimize the need for excessive synchronization.
Rather than just sitting back and watch as ICANN allows the demands of money to corrode an essential function of the network DNS root operators can coordinate using their leverage to effect change to ICANN and its governance.
IP addresses of the root servers to bootstrap the entire system are configured in countless millions DNS servers. What is ICANN going to do send out a memo asking the entire network to please update their root list?
There are solutions to ICANN which do not involve fragmenting the system. All that is required is for the operators with power to effect change to coordinate to send a message which can not be ignored.
I've been telling people this ever since SSD drives came out. A system with 2GB of DRAM and an SSD drive will easily outperform a system with 8GB of DRAM with a traditional Hard Drive in every benchmark that matters to the average user. It'll boot far, far faster, programs will load instantly, defrag's are a thing of the past, virus scans take mere seconds instead of hours, and by the time your SSD drive is used up, you probably need a new computer anyways
Unless you need to use 8GB of RAM to complete your work. At which point your totally screwed. I'm pretty sure using an MLC SSD as virtual memory at this scale voids your warranty.
Now mix two Corsair SSD drives in RAID 0 like i've done for the past year along with 4GB of DRAM and the PC absolutely screams, there is no comparison, none whatsoever between traditional hard drives and SSD drives. Even (6) 15k RPM SCSI drives in stripe RAID can't keep up with the I/O of 1 SSD.
A pair of mirrored 7200 RPM disk drives with 32 GB of RAM and a warm cache runs circles around your setup. It would also be more reliable, cheaper and provide 10x the storage capacity.
Slashdot Mirror
I can only assume that they've corrected for General Relativity. Everyone seems to be pointing to the obvious potential sources of error: knowing when the neutrinos are created, knowing when they arrive, knowing the distance that they've traveled.
What about variations in the Earth's gravitational field between the two clocks? Or along the path that the neutrinos follow? You can't call the planet a point-source of gravity - the density of matter is quite lumpy.
I haven't seen a back-of-the-envelope calculation for this...maybe it's orders of magnitudes impossible? Would it require a tiny black hole to throw the timing off by 60ns...or would a big uranium deposit be enough? I could probably do the Lorenz transforms for Special Relativity myself, but General is a bit beyond me.
I punched some numbers into the realitivity calculator and came up with half a millimeter difference in length over 730km with the contribution of the dent in spacetime made by the mass of the earth completely removed therefore any small changes due to local masses are simply irrelevent. The effect is some 200 times greater than the effect of gravitational time dialation on earth.
http://www.1728.org/reltivty.htm
I used 11.18 km/sec to get the change factor as this is the escape velocity from earth. (Gravitational time dialation is the same as time dialation due to acceleration at escape velocity)
The gamma factor from the calculator is 1:1.000000000695364
Over the distance in kilometers
730:730.00000050761572
In millimeters:
730000000:730000000.50761572
If the earths mass did not dent spacetime at all light would be able to travel an extra .50761572 mm over the 730km distance given the same time.
the history of the PC. How many decades did it take for us to get where we are? The first PC was some 50 years in the making and by today's standards was downright laughable in its capabilities. The first computers weren't Von Neumann machines either. You had to have a team of dedicated operators reconfigure patch cables between between outputs and inputs for each an every calculation! To be so pessimistic so early in the life of quantum computing is insulting to the progress we've made so far which is considerably outstripping the pace of development of the modern computer.
My pessimism is driven by a firm belief there is no free lunch in the universe. There is no perpetual motion. There is no well of infinite computation.
If you think your going to be able to answer questions requiring classic processors having the mass of the sun with a QC having many thousands of entangled qbits in a single coherent system I *believe* this is fantasy.
If your bar is much much lower.. say cost effective QC on desktops which add 1k, 1m or a billion times performance for some classes of problems over what we have now then yes I agree with you this future may well be possible.
In my view a computer a million times more performant is very useful however in the end even while this may seem impressive these sorts of advancements do not hold a candle to the origional promise of QC.
Ever, & since that is the case? I don't contract BEAST either. Pretty simple, first of all...
What is to stop someone from using a location redirect header to collect encrypted response known plaintext with javascript disabled?
This smells like the same issue openssl patched 10 years ago.
Am I correct in assuming as long as you don't set
SSL_OP_DONT_INSERT_EMPTY_FRAGMENTS your good to go and this attack does NOT effect you for SSL 3/TLS1?
If not is there any protocol level information avaliable? The gooblygook in TFA is not particularly helpful.
This is orders of magnitude smaller than what is seen here. The relevant length scale of earth's mass is ~cm, i.e. if all the mass of the earth was concentrated in a black hole it would be the ~cm size and only path length difference on the order of cm would be seen (if you were very close to the black hole's surface). The earth is far from a black hole making the GR corrections much much smaller.
Gravitational time dialation is exactly equal to the time dialation experienced by acceleration to the escape velocity.
It's an easy calculation, and about 3 orders of magnitude (or more) too small.
Without any mass energy pressure on the metric the difference at sea level over the 732km distance is 97 feet or about 100ns faster so you are most likely correct.
Gravity follows inverse square law with distance if you were down far enough underground wouldn't the deformation of the metric be somewhat different due to significant masses below AND above you?
If you compared the underground effect with above ground laser results the true time/path length thru metric is slightly different.
Taking the number of solar panels needed produce roughly 245 watts apiece. Remember that previous number? It's about to get a whole lot bigger. Roughly 10.49 billion watts is the total output. That translates to approximately 7.67 trillion killowat hours per month
While I applaud people who attempt to do the math the average hours of usable sunlight per day is on the order of 4-5hrs when you figure in cloud cover, night time, fog,smog...etc over much of the US.
What really sucks about solar is not the cost of panels. The major problem and cost come from energy storage and distribution. For any significant dent the grid would need to be overhauled or we would need to see dramatic advancements in reliable cost effective energy storage.
Makes sense if it stops the current Russian Roulette of installing a Windows or Android app and praying it's not stuffed to the gills with Malware. This is the primary reason many feel safer with iOS.
There have been a number of malware apps removed from the Apple store *after* successful approval.
Even if Apple had the source code it is not possible to detect intentionally hidden malware the same way it is not possible to detect all security failures in their operating systems and browsers.
MS platform is in the best positionin terms of malware. They do not need to review anything to keep their platform safe. The app and its entire view of the system is completely isolated in its own world. Necessary interactions with the rest of the system such as selecting a stored image are handled by system choosers where data is always copied.
There is no reason they need to lock down the system in this way. They are just being greedy.
Still use File Manager? Or is that too modern for your tastes. Metro is an extremely compelling design language. Your cynical I-hate-everything-I'm-not-into doesn't change this fact
LOL you stated an opinion and then asserted it to be a fact.
It is funny listening to people who make the argument you whine because you just hate change you hate anything new you are not used to and therefore we can afford to simply ignore your criticism.
It is more amusing over the years to watch the backtracking done by MS after they hear the market repeat some of what those same people had been saying all along.
Actually the complete opposite needs to happen. The way the government stopped the smuggling of alcohol and the related gang/mob violence during prohibition was to re-legalize alcohol. Make drugs a legal product and have the government tax the profits. It will immediately stop all this wasteful drug related violence and security expenditure.
I have a better idea. If someone tries to sell you drugs make it legal to shoot them in the head and hang their body from a bridge.
It would not surprise me if he ends up finding more vulnerabilities than the rest of the world combined and he does it exclusivly for fun/challenge.
"Responsible" disclosure does tend to mitigate problems in the real world much like a virus scanner installed on a random desktop.
However neither approach provides the proper incentives to the market to address the root cause of the design/process deficiency which allowed the defect to occur. Responsible disclosure actually artifically lowers the cost the industry has to pay for a security failure only while it is found by someone who is deemed to be "responsible". This makes all software less safe in the long run.
I don't need backwards gimmicky UI concepts that look like total crap (WP7) or apple style lockin hell app stores and I have zero interest of any kind in touching my monitor. It looks gross enough as it is.
If the new UI can't be turned off and I mean turned the hell **off** then no sale.
Progress to me is defined as enabling me to get crap done. Distraction and game playing (not keeping your designers on their leashes) is not progress -- it is a waste of everyones time.
You know what would really be cool is a boost style dimensional analysis system bound to schema meta data. Otherwise is it really necessary to invent a new a new language to introduce strict mode to existing query languages?
With every domain name you own you should be able to get an SSL cert with your registration/renewal. I want to register this domain and here is my CSR as part of the registration process.
CAs were supposed to verify you independantly of domain ownership so that identity problems such as bad actors getting certs for gooogle.com..could not occur.
Today the process has been soo watered down humans are too many cases not even in the loop. All distinction between identity and domains for all practical purposes does not exist.
Give everyone with a domain name their own SSL certs and stop throwing money at CAs. The network will be marginally safer for it.
IMHO all of these products, including motors for hybrid vehicles, are too important to allow China to trivial blackmail the rest of the world at their pleasure. All that is needed is the US government to guarantee purchase at some set price and dozens of new mines would open overnight in the US.
It is non trivial to bring these online. It takes on the order of years but this ball is already rolling.
The chinese might be able to screw the market over in the short run.. over the long haul they are only screwing themselves.
Agreed. I have always had a hard time stomaching the theory that dark matter and dark energy exist. It seems far too much like aether, i.e. something made up to fill a gap in knowledge without much evidence backing it up. "Look, my equations don't work out in every situation. EUREKA! If I just make some shit up like say, invisible matter that doesn't interact with other matter except through gravity, I can make my equations work!". I think its probably that the equations are based on more special cases. Think of the difference between Newtonian and Relativistic models. One works on planetary scale, the other on the level of star systems and near galactic scale, but now we find out our current model doesn't work in every situation such as quantum scale (yes, they've know that for awhile), or on super macro-scale. It must be that the model needs additional generalization rather than inventing magic stuff.
DM and DE are two totally separate ideas. Don't mix the two or attempt to draw the same conclusions with the same brush. Chances are if you do that you will be wrong.
Dark was chosen because we did not know what the heck was responsible for the unexpected **observations**. We could tell there was more esplainin to do but the answer was noowhere to be found.
DE is blatently obvious given astronomer obsession with the hubble constant being critical to understanding evolution of the universe.
DM is much more difficult to see however both effects are very real.
Yes people have invented many **theories** to try and explain both DM and DE. Some were constructed ontop convinent self-referential foundations. They can't all be right..most or all of them will be discarded as more observations and experiments are conducted. This is how the process works. You can make fun of a theory all you want but you don't get the same leeway with observables.
The negative gravity thing is interesting.. it will be tested soon enough. Personally I don't believe for the following reason: During a matter-anti-matter collision what is the gravitational color of the resulting energy produced?
OMFG for months we've been hearing western nations cry bloody murder over Middle eastern government oppresive measures against their own telecom infustructures...
This colminated with the fucking UN declaring Internet access to be a human right.
Now we have ourselves some relatively minor incidents of civil unrest and the very same (mostly european) countries are doing the very same shit they were previously so adamantly against.
I hope BART gets sued to hell.
Windows machines can be pretty secure on their own too, but once hooked up to an active directory domain they are only as secure as the weakest point...
Just because a windows computer has joined a domain does not mean the domain now has root or for that matter *any* access to the local computer. It is still determined by local policy.
Also, this seems to be a particular authentication scheme which is flawed, windows has similar flawed schemes (google: pass the hash).
Windows of today uses kerberos.
Just randomly bias each smart meter or print different peak/off peak times on everyones bills.
Realtime minute by minute rates could actually use feedback from the grid to improve reliability or respond to emergencies where n-1 could otherwise not be achived. You just include grid stability in the cost calculation.
I don't understand what the point of TFA is. It is as if they just discovered if you enter x2 into your calculator and keep pressing = it quickly starts to display larger and larger figures before erroring out.
As long as I can install a skin to restore the search bar and whatever else disappears I could care less what the default UI is like.
Following the rest of the lemmings off the cliff with an integrated search/url bar is a receipt for information leakage and annoyance.
Depends entirely on the workload. The HD drives will lose if:
a) The working set exceeds 32GB. If the accesses are random, they will lose by 2-3 orders of magnitude.
If the working set exceeds 32GB would you expect the system with only 4GB of memory to have a chance? I'm sure you could think about it for a while and dream up a mythical workload with just the right characteristics to make it work.. for a few hours anyway until all the oxide on the flash gates is gone.
8GB ram = $50.
b) Whenever there is a need to commit or sync the writes to disk. On a normal system, that will happen every few seconds. If you disable that, your reliability argument is gone
I was thinking more in terms of storage reliability. When SSDs fail they more often fail specatucularly with no warning. RAID0 is less reliable than single disk. A failure of any disk means the entire array is unusable.
In terms of flush I would never advocate disabling writes to persistant storage under any circumstance. A performant system would coalesce as many operations into a transaction as reasonable to minimize the need for excessive synchronization.
Rather than just sitting back and watch as ICANN allows the demands of money to corrode an essential function of the network DNS root operators can coordinate using their leverage to effect change to ICANN and its governance.
IP addresses of the root servers to bootstrap the entire system are configured in countless millions DNS servers. What is ICANN going to do send out a memo asking the entire network to please update their root list?
There are solutions to ICANN which do not involve fragmenting the system. All that is required is for the operators with power to effect change to coordinate to send a message which can not be ignored.
I've been telling people this ever since SSD drives came out. A system with 2GB of DRAM and an SSD drive will easily outperform a system with 8GB of DRAM with a traditional Hard Drive in every benchmark that matters to the average user. It'll boot far, far faster, programs will load instantly, defrag's are a thing of the past, virus scans take mere seconds instead of hours, and by the time your SSD drive is used up, you probably need a new computer anyways
Unless you need to use 8GB of RAM to complete your work. At which point your totally screwed. I'm pretty sure using an MLC SSD as virtual memory at this scale voids your warranty.
Now mix two Corsair SSD drives in RAID 0 like i've done for the past year along with 4GB of DRAM and the PC absolutely screams, there is no comparison, none whatsoever between traditional hard drives and SSD drives. Even (6) 15k RPM SCSI drives in stripe RAID can't keep up with the I/O of 1 SSD.
A pair of mirrored 7200 RPM disk drives with 32 GB of RAM and a warm cache runs circles around your setup. It would also be more reliable, cheaper and provide 10x the storage capacity.