2418 posts • joined 10 Jun 2009
Regime change, anyone?
Same idea as rural networking, but a different application, for brave people living under repressive regimes. Build your own hidden communications network.
This more or less happened in Libya, although the rebels "stole" the existing wireless network infrastructure rather than just installing their own.
Re: Rural networking
It's not a new idea at all. Years ago I read about the installation of a working telephone booth at the Burning Man festival, using a chain of off-the-shelf routers strung across the Nevada desert. It's just that it's getting more affordable, and the RPi lets you integrate things like battery and power management to a greater degree. There are also quite a few routers that one can "jail-break" and convert into small fully programmable Linux boxes. (OpenWRT, etc.)
A related idea would be just to use a pair of solar-powered RPIs (or OpenWRT boxes) to wirelessly bridge a road. This is useful, because while you might persuade a few landowners to let you string a fibre across their land, just try getting permission to take a fibre over or even under a public highway. So, don't try. Just put a solar-powered fibre-to-wireless router on each side. You wouldn't even need directional antennae (which may not be entirely legal).
Re: My project...
Victorian terrace should be easy! It has floorboards? You can push your low-voltage low-bandwidth wiring into the cracks between the boards in ine direction, and pull wires through the space between the joists under the floorboards in the other. Modern flat with a solid concrete floor is harder, though if you have carpet you can also easily put wiring under the carpet.
Very thin copper wire or tape attached to a wall, wallpaper-glued down with tissue paper and painted over would probably also work. I once attached a multi-element FM antenna to a ceiling that way (antenna made of aluminium foil, then papered over and painted). Worked a lot better than a dangly wire, and a lot cheaper than getting a man to attach a proper antenna to the chimney. The room needed painting anyway.
Or with RPi at £30 ... go wireless?
Fairly challenging, but a case of open-source development once, fix hundreds of thousands of people's problem.
It ought to be possible to connect an Rpi, a solar panel, a battery, a weatherproof box, a USB hub, some USB wireless thingies and some directional antennae, to make a goes-anywhere wireless access point. Stick that on a pole in a field somewhere, with line of sight to another pole, and another, and another ... chain them together from a location that can get broadband, to a village or hamlet that can't.
Software that auto-assembles a network, so apart from configuring the broadband end the future problem abounts to errecting poles, screwing a box onto the top, and pointing the antennae in appropriate directions.
It's a cheap somewhat limited implementation of something that the military are playing with for battlefield communications, and disaster relief agencies for getting communications up again after a natural disaster.
We can't even work out how to communicate with cetaceans. What chance have we got with something with which we share no common ancestry at all?
(They sometimes save our lives by swimming us back to dry land. That shows a remarkable capacity for abstract reasoning by dolphins and orcas, and inter-species empathy in advance of our own. )
Re: No such thing as degrees Kelvin.
Which has just made me think, why haven't I ever seen use of kK or MK? (temperatures appropriate for describing stars).
(Unlike the Yg, which isn't NEARLY big enough).
Re: Anything we can do
Even if they happen to be within a few tens of light-years, even if they are currently watching Lucille Ball on Earth-TV and trying to work out what those strange techno-primitives are up to, they may still be thwarted by real-world physics. In other words, they've come to the same conclusion that our scientists have, that interstellar travel isn't ever going to happen outside of the movies. No wormholes, warp drives, ZPE drives, reactionless drives, or any of the other devices that SF authors use to get an interstellar plot going. Just rocketry and relativity and radiobiology, saying "can't be done".
My riposte to the (strong) Anthropic principle is that the universe is NOT optimised for Homo Sapiens. It's optimised for our silicon successors, who'll be able to slow their clock rates down so that a thousand light-years becomes a few years subjective. They'll prefer just about anywhere in the universe to those hot balls with moist oxidizing atmospheres, where some (mostly ridiculed) few amongst them think their ancestors must have developed, back before the Archives and the Memories.
In the worst-case scenario, they're here in our Oort clouds already, we're making far too much noise, and they're getting ready to drop a comet on us. (It worked last time, 65 Myears ago).
The day the earth caught fire ...
Premise is utterly bonkers. A bad fantasy. No science at all. Newton would have discovering relativity as a consequemnce of how fast he'd be spinning in his grave. Even "The day after Tomorrow" made more sense.
Re: +1 for Twelve Monkeys
It's a brilliant movie and has an SFnal framing device, but does it really count as an SF movie? If it does, what about the even more brilliant "Brazil"?
At last. I was thinking I was the only person who thought it a worthy contender to replace Zardoz.
They could move away, just as AMD managed a transparent shift from i686 to x86.
The easiest route might be something like a bigLITTLE architecture with ARM cores and x86 cores on the same die, sharing cache, memory controller and maybe other internals. Gradually shift the balance of core provision towards more ARM cores and less x86 ones, as software takes advantage of the new feature.
Intel vs. Arm
The ARM architecture is intrinsically more efficient than x86. If one could compare an ARM CPU against an x86 CPU implemented using the exact same fab process, ARM would win. (OK, for flat-out number-crunching the design of the FPU also becomes a very significant factor and Intel may have a sufficient edge to win here - thought Nvidia does it even better if you can run on a GPGPU instead of a CPU).
At present you can get an intrinsically inefficient x86 CPU implemented on Intel's proprietary process, or an ARM CPU handicapped by an inferior process, and the result is something close to a tie.
Re: A tenth of that?
it was a coding error from someone who thought "hey, she will only fly for a few hours however, so why bother".
Someone thought that way in safety-critical code? Please reassure me it was just the in-flight entertainment system.
Where's the scream icon?
Re: Sacrifice some weight
Out of interest - how much weight does the Lithium battery save, compared to an NiMH stack of the same capacity?
Would lead-acid be allowed in an aircraft? Spilled acid in an airframe would be very undesirable, even if gelled. Even more so, the hydrogen gas that the things emit under failure / overcharge conditions or when spilled acid finds something metal to react with.
Re: Slaves to convenience ( and Intellectual Property)
Indeed. What we have here is an very unsurprising demonstration that the ruling party in a post-communist but still centralist, controlling and repressive state doesn't understand open-source. It's a bit like expecting a mole to understand flying.
Walled garden versus open source is an old discussion. Evidence so far is that given enough time, open-source always wins. Recently Apple, with its massive first-mover advantage, is losing ground to Android. But that's just a recent skirmish in a war that's been going on since bacteria developed plasmids, and higher organisms developed sex - both means for spreading their source codes as far and as wide as possible, and for maximising the amount of development thereof. (Mutually synergistic, of course).
I'm reminded of the USA experts laughing at the USSR's avionics in a defector's jet, that still used thermionic valves (tiny peanut-sized ones).
Until someone pointed out that valves are EMP-proof, and transistors aren't.
Not quite here yet
Seagate website says "no price or purchase options available". Sigh.
I'm surprised no-one has mentioned this possibility (or impossibility, depending on quantum gravity and other physics we don't know much of). Wonder if there's any hope of learning more by studying this beast from the very great distance we're at.
Indeed, it's a great idea
For a long time it's offended me that most datacentres are busy throwing away heat to the air outside, while the same building is burning fuel to keep its inside warm for the people that work there.
In fact one can source airconditioning plant that pumps heat from the air in the server farm "uphill" into the building's central heating system. However such plant has a higher capital cost, and the IT people and the estates people and the finance people don't properly talk to each other and argue over "whose budget" rather than seeing the "interest" on the capital invested (arriving by way of a reduced fuel bill). So it's rare to find such a system. Personally I'd say legislation or tax breaks should make such airconditioning either compulsory or highly tax-advantaged.
CPUs are happy running at 80C so they could be "cooled" by water from a central heating system. Trouble is that water and electricity don't mix. The tiniest leak from the CPU cooling circuit can trash the motherboard. Cue a nonconductive inert liquid which could be pumped through heatsinks above the CPUs and then through a heat-exchanger plumbed into the central heating system, with no aircon (pumping of heat uphill) required.
Looking further ahead our CPUs could be happily running at 100C or even 120C if they were designed and tested to do so. Nothing in the physics says it can't be done. They'd slow down in proportion to the increase in absolute temperature: 60C to 120C is 333K to 393K, so that's about 20% slower. In most environments a couple of extra cores on the chip would be adequate compensation for the lost MHz.
Re: Religious Use
In all seriousness, shouldn't the Mormons buy this site and run it forever free and advert-free? All they have to do is convert one of the still-living, and all those ancestors are instantly saved.
Does anyone know for sure whether the Firefox Flashblock plug-in (which I use) is a generic fix for these problems in respect of any flash stuff that you don't actually choose to display? In other words does flashblock keep the flash data strictly away from the flash code until you click on the logo?
Should be plaintiff pays all bills until he wins.
Short of scrapping patents or drastically modifying what is patentable, how about this?
The plaintiff should be obliged to pay for the defense as well, on a dollar-for-dollar basis. If he won, he would be awarded costs that cover all the money he paid for the defense as well.
This would mean that small companies would no longer fear being sued by a bigger outfit with deep pockets. They could never be forced to concede, because the cost of defending their patent would be even greater than the cost of paying for a license from a troll.
I've found myself wondering about submillimeter (Terahertz) directional antennas, and moth antennae. Do moths get completely confused by artificial lights not because they emit light, but because they're a strong source of THz emission? Just a thought. Has anyone tested moths' response to a completely cold light source (ie one that's not also strongly emitting at THz? )
Combustion of a "body" has been demonstrated, using a pig carcass dressed in clothes in place of a human body. No mystery.
Better still to buy some hybrid rechargeable AAs and a charger, so you use the same batteries over and over again. (Hybrid NiMH are the ones that will stay charged for many months - ordinary NiMH go flat in about two).
My DAB radio needs new batteries every week. Progress? I think not , but it does let me listen to BBC World service in my bathroom. Thank heaven for rechargeables. Must be approaching their 200th recharge by now.
I wouldn't even say tricky
Clockwork and dynamos are very old ideas. Putting them together to power a radio shouldn't be patentable. By all means register your design so that others can't copy it exactly. By all means patent any mechanical widget that makes the clockwork dynamo work better than it ever could without that widget - if there is such a widget involved.
But patenting a concept that amounts to connecting a radio to a power source ought to have been thrown out by the patent examiners! Even if there wasn't any prior art for clockwork radios, it STILL shouldn't be possible to patent the concept.
Whatever next - a patent on kiddies' play bricks with rounded corners? Oh, wait a moment ....
Re: Not a meterorite
It's literally boiling the water in the atmosphere as it comes in.
A masterly understatement. It's literally boiling the iron or whatever that it's made of. It's probably going past that, all the way to plasma. Afterwards, the iron, silicon, whatever condenses (as oxide, mostly) and hence the thick trail.
If you watch the car footage you can actually see the trail appearing to burn for a few seconds. I expect that's a Nitrogen - Oxygen fire, or possibly or additionally an Oxygen - Iron fire if the meteor was iron.
One of the worries prior to testing the first nuclear bomb was that it would ignite an (exothermic) Oxygen - Nitrogen combustion, that some thought might propagate to consume the Earth's entire atmosphere and everything living therein. I wonder if someone else pointed out that were that possible, a meteor strike would have done it long ago? Or did they just chance it?
Re: Russians - hard as nails, not fazed at all
My thought too. Are Russians completely unflappable, or is it a language where excitement is conveyed through choice of words rather than tone of voice?
It's even more noticeable in the other video, of people when the shockwave arrives and smashes loads of windows.
Re: Not a meterorite
"Should have been vertical". You must be a troll. No-one can be that thick around here, surely?
Almost horizontal means that its intersect with the Earth just clipped our atmosphere. Dumped most of its energy at a decent altitude. Bloody good thing too. If that had come in much closer to vertical it would have been far more destructive of whatever was underneath.
Re: How 'sensitive'? Not very.
Much better if society can be persuaded to mount an "immune response" BEFORE the next outbreak of ethnic cleansing, rather than after.
A lesson from history. In the late 19th century the unified state of Germany was formed to great public acclaim. Its new citizens queued up to obtain their papers. The form they filled in was quite simple. One of the questions was "Religion" to which many happily replied "Jewish". After all, this new state had for the first time granted them constitutional protection against harassment and discrimination.
Scroll forwards to the late 1930s and their parents' replies stored in dusty filing cabinets doomed not just the parents, but children and grandchildren not even born at the time.
For far too long councils and other quasi-governmental bodies have been recording our racial details for no good reason. What business is it of theirs whether someone applying for planning permission or a parking permit is black, white or green?
Anyway, perhaps now we can request all the data that they hold about us and the reason keeping it, point out that it was obtained coercively and that we do not consent to them storing or processing it.
Personally, I always tick the "Other" box and write "Human". It's only been rejected once.
Re: There's the Kool-aid...
people like me will get sick of trying to retrain them and just go with linux instead.
There's also Linux-lite, aka OpenOffice / LibreOffice running on a Windows PC. It's probably easier to re-train someone off Office 2003 onto OpenOffice, than it is to re-train them onto Office 2007. And the OO folks seem mercifully free of the desire to inflict new interfaces on their users in order to look cool.
And of course the price of OO / LO is very competitive indeed.
I'm surprised that the obvious seems to have been missed. Busses spend a lot of time stopped at predefined locations - bus stops. Put the induction chargers at the stops (only). Give the busses some sort of secure-ID so that the charging turns on only when there's a bus at the stop. Installation cost greatly reduced, freeloader problem greatly recuced. Add yellow lines and discharge monitoring and cameras for further defense against freeloaders.
Ooh err missus
Blow? Hole? Continu??!!!!!!!!
Re: We should be told...
No, the day after they turn it up to full, they should announce that they accidentally destroyed the universe last night, but nobody apart from a few particle physicists actually noticed.
Many scholars have tried and failed to crack Etruscan. There's no Rosetta stone. If this program can crack it, then it's a major advance. If not ....
Have they tested it on Basque, absent any help from a speaker of that language? Again that would be an acid-test. Banque is one of the world's anomalous languages, not related to any other in any known way.
Missing - hybrid drive?
I'd really have liked to see that review also compare a hybrid drive such as Seagate Momentus. Yes, it's a slow sleepy 2.5 inch laptop drive, but how much difference does that built-in flash cache make? And being out past the drive end of the SATA connector, it'll work with Linux or anything else you care to boot.
With Linux it is trivially easy to put the operating system and your own small / heavily accessed files onto a small SSD. One can configure a completely useful Linux system in 30Gb (about 15Gb of system files, 15Gb /home). Unfortunately 30Gb SSDs are slower than 256Gb ones, but they share the same near-zero seek time. Again it would be nice to see that benchmarked.
Re: no disincentive
For some criminals, especially the violent ones, you are right. Some aren't deterred. Their crime doesn't make any economic sense in the first place. But I'm fairly sure that most of those who steal for a living consider their personal risk-reward ratio. Upside: ££££. Downside: self-assessed cost of punishment times chance of being caught. Commit crime if upside > downside. Especially so for those whose crime is planned rather than impulsive.
Crimes against infrastructure cost society a large multiple of the gain to the criminal, and the sentence should therefore be disproportionately heavy. The criminals won't suddenly go straight. But they will go back to the sort of crime where the gain to the criminal approximately equals the loss to the victim or his insurer. In other words they'd stop nicking cable, and go back to nicking cars or breaking into banks, and society at large would be better-off.
Pour encourager les autres
That's more than you'd get for rape or manslaughter.
And arguably it should be. With those crimes there is one victim, seriously affected. With cable theft there are hundreds, thousands, even millions of victims.
At present they are getting away with it. In wartime it would be called "sabotage" and would be seen as a capital crime, punished much the same as treason. An appointment with the hangman would be quite likely.
Personally I'd say work out the economic damage caused by crimes that wilfully damage infrastructures, and sentence them to what they'd get for stealing the same amount of money from a bank's safe. What would yet get for breaking into a safe and emptying it of a million quid? Five to ten years sounds about right.
And the best thing is that with this sort of crime, one heavy sentence would convince just about all criminals to go back to the sort of theft where there is only one victim, where the gain to the criminal is not a tiny fraction of the cost to society.
Re: I would like
For warrantied quality, buy enterprise-grade drives. They do cost about twice as much as bog-standard desktop ones, though. Personally I'd much prefer two drives mirrored - one made by WD and the other by Seagate, so as to minimize the chance of both coming from the same defective batch. But that's not an option in a laptop.
You must have bought a bad batch. It happens.
Other folks aren't having the same problem. It would be the number one story in the tech press if they were.
Did you buy all your drives in one batch? (Or all the PCs containing the drives in one batch? ) If so, the likely explanation is that all the drives are the same production batch, which contained a defective component. If PCs were cars, there would have been a recall.
Talk hard with the supplier. You need all the non-failed drives in the batch replaced a.s.a.p. and it should not be at your expense. (Although you're probably better biting that bullet anyway, if the drives are out of warranty and the PC vendor has gone out of business).
At my workplace we buy a couple of hundred PCs every year, and the reliability we've seen hasn't changed noticeably over the last five years.
Re: SMR has its uses
Yes, SMR plus a big flash cache managed by the drive firmware sounds very plausible. I can't help observing that Seagate is the company that springs to mind in connection with flash-cache drives.
Also yes, one will need to be very careful that if one is doing server-style things with desktop rather than enterprise drives, one doesn't accidentally buy an SMR drive. (I have visions of someone replacing a 2Tb drive in a RAID-5 array with a newer one that uses SMR. Ooops! ).
Suck not blow
Most of the fluff and dust in a PC is doing no harm. The exception is the fluff that gets blown down between the heatsink fins, which makes it run hotter and ultimately throttles its performance.
It got blown in so you have to suck it out. Make sure that you immobilize the fan blade with a finger, otherwise the reverse airstream from the hoover may rev your heatsink fan to destruction.
The usual hoover crevice tool is too large. I use a length of PCV oval electrical duct pushed into the crevice tool, that's narrow enough to get down between the fan blades.
Re: Those aren't that bad
I found a dead mouse once. A mammal. Inside a PC. Poor little beastie had inserted its head between an Opteron's cooling fan and the heatsink. I really hope that this broke the beastie's neck, because otherwise its death was horrible in the extreme.
I then spent ages studying the case trying to convince myself that it had any hole that a mouse could squeeze through. I couldn't. But it must have managed it somehow.
Another time I took the side off a PC and bits of dust started hopping around ... the cat had had a flea problem.
Re: SciFi Toasts BRAIN
I don't know the details of AES etc, but it's a much greater class of problems than just asymmetric crypto-breaking that could in theory be tackled by a quantum computer.
Basically, N qubits can represent all numbers from 0 to 2^N-1 at once!. You then perform a series of operations on those qubits that if performed on a single number, would tell you (yes or no) that it was a member of the set of solutions smaller than 2^N-1 of your problem. For asymmetric cryptography, that search is for one of two large prime factors. You then observe your system in the quantum sense. It must collapse into one of the possible solutions of your problem - one of the two prime factors, which is all you need to break a code. For other problems there might be a known or unknown number of solutions larger than two, but provided the number of solutions is smallish, repeated runs of your quantum computer would statistically guarantee you'd find all of them ... even if knowing just one isn't all you need to get the rest conventionally.
As the number N of coupled qubits becomes large, quantum computing becomes exponentially closer to magic. That, or we discover a reason why it stops working when N is bigger than some new-physics-determined number.
The observable universe contains something of the order of (only!) 2^84 hadrons. This is why I find it inconcievable that a quantum computer could work with N qubits in the hundreds or thousands, let alone all the way up to millions, trillions and beyond. (Avogadro's number is ~10^26! )
Greg Egan writes the hardest of hard SF. For one possible implication of a working quantum computer for large N, read "Luminous"!
Quantum computing and Physics
I've long been telling people that I expect the on-going failure to construct a significant quantum computer (hundreds of qubits) will be a gateway to new physics. There's some reason, that we don't yet have an inkling of, why it can't be done. In cosmology, there are similar thoughts surrounding rapidly rotating black holes, naked and ring singularities, and time travel ... but (perhaps fortunately) experimental cosmology is a long way off.
The alternative is that the universe is even wierder than I'm currently prepared to contemplate. Also, mundanely, that all cryprography is toast!
Re: What about UK?
Would you be automatically guilty of crimes?
Probably, if you didn't immediately reach for the factory-restore disk .
Anyway, could you sensibly do anything else? God knows what else these sick bastards might have infected your computer with!
the logic that's really required?
If ( browser in standard_compliant_browsers ) then
Of course if your business isnvolves selling stuff to morons, that's probably not good enough!
@RAMChYLD Re: NO problems with old Samsungs
Well, we're still using ~60 Samsung 1600x1200 monitors bought about six years ago and format-wise preferable to the 1920x1080 ones you get today. (They also pivot for 1200x1600 if you like that).
None failed in warranty. Two have failed since. I blame London Electricity for frying their power supplies.
Don't generalise from a small sample, or from a single product. All manufacturers occasionally ship lemons. The real test is how much hassle the warranty service puts you through. I don't have mucjh experience with Samsung because their products don't seem to fail during warranty. (And they stay reliable after). IIyama are very good. Acer and Dell were once so bad that we stopped buying from them.
Re: 1TB? no problem!
Something wrong with that heat calculation.
1Pb = 360 (say) 3Tb drives. Power consumption of WD 3Tb "Red" active read/write = 4.4W. http://www.storagereview.com/western_digital_red_nas_hard_drive_review_wd30efrx . 360 x 4.4 = 1584W. You can run that off a single 13A domestic outlet, even allowing for PSU inefficiency and all the cooling fans.
You WILL have to make sure your domestic Petabyte server does a phased disk spin-up, because the power demand of a disk drive while it's spinning up is usually about 20W for about ten seconds. 360 x 20W is 7.2kW, about the same as a somewhat weak electric shower unit, so you'd just have to spread the load over two domestic circuits and four 13A plugs if you weren't sure it would never spin up all the drives at once.
BTW those WD Red drives are extraordinarily quiet, so you wouldn't need ear-plugs provided you could find some enclosures that used big 12cm fans, rather than huge numbers of 6cm fans.
- Vid Reg bloke zips through an iPHONE 6 queue from ZERO to 60 SECONDS
- Anal-ysis Buying memory in the iPhone 6: Like wiping your bottom with dollar bills
- Teardown Pop open this iPhone 6 and see where the magic oozes from ... oh hello again, Qualcomm
- Competition Your chance to WIN the WORLD'S ONLY HANDHELD ZX SPECTRUM
- Analysis Apple's warrant canary riddle: Cock-up, conspiracy, or anti-Google point-scoring