Carrock

Really? The only relevantly rated high spec starter lead-acid car battery I've seen was 40AH 160 amp crank current for 2 minutes at -20deg C i.e. about about 5AH before the battery needs to depolarise and cool; before another 2minutes of cranking. Your jump starter is 8AH; the 800 amp crank current is not needed here but makes the battery sound better. X-posted with Ghideon.

Factcheck alert: From Grauniad tabloid: size matters, but not as much as content: Philippa Clarke said

Diamond is best but beryllium oxide is excellent for this. It is extremely toxic but it seems it is being replaced by aluminum nitride. There are various other solutions - provide more information or look for how a problem similar to yours has been solved.

This idea that e.g. some entities e.g. electrons can be/are in a superposition of states while others e.g. grains of salt can't be has been popular from time to time; sufficiently for experiment to rule it out. (I recall this but can't yet find a reference.) The basic problem is you would need some sort of physics to kick in as small QFT regime waves or whatever accrete and somehow become classical particles. https://en.wikipedia.org/wiki/Quantum_decoherence is interesting e.g.

Nice if it was that unambiguous. From https://ghr.nlm.nih.gov/primer/testing/genepatents It's likely a vaccine or a weakened virus would contain some patentable DNA according to the above. Interesting question whether a COVID-19 virus mutation found in an infected human is classed as natural or a DNA sequence altered by a human and not found in nature. Monsanto has informally stated it won't sue while less than 1% of a crop is copyright Monsanto weeds... Rich pickings for lawyers. Some people know the cost of everything and the value of nothing...

Somewhat too simplistic to be helpful? Perhaps I'm being a hypochondriac, but I'm rather concerned that every time I run for a bus in inclement weather I come down with all the symptoms of coronavirus.

After London tapwater is bottled, the water is "premium tasting water accessible to everyone." How could premium tasting water not be worth a premium price? It's also "purified and enhanced with minerals" for designer limescale in my kettle rather than the plebeian limescale I get from tapwater. Importing a bottle from America is on my bucket list. Strangely, it's not on sale in London. [Later] Seems it's not bottled in Sidcup any more. https://en.wikipedia.org/wiki/Dasani Perhaps it should be the very last item on my bucket list.

You could distill the water to make it very pure. The only downside is it doesn't taste very good. Coca-Cola used to sell excellent bottled London tapwater which tastes rather better than distilled water and was safe to drink. Fortunately all I have to do is turn on a tap... If I thought a source of water unsafe to drink without filtration, I wouldn't trust it after filtration either unless I knew exactly what was wrong with it.

Not clear what the cosmic neutrino background has to do with anything in this context. In particular matter even at relativistic speed is very different from the massless CMBR. The CNB dropped out of equilibrium at about BB +1sec; it has been largely undetectable since then. Its temperature is about 1.95K, another important difference from the CMBR at 2.72K.

Sounds good, but The cables themselves do not need to be brought up to non ice temperatures, particular the inner ones. If the sheaths completely surround the cables, it's impossible (without a refrigerator) to avoid the cables being brought up to non ice temperatures. (Ignoring end effects.) If heating the cables, the heat flux is independent of the heat transfer coefficient (for constant power). Whether the heat transfer coefficient is high enough, in near freezing conditions, to make the heated cable(s) hotter than they get in summer (At least 27C*) is a matter of engineering. £200 million retrofit? ......... The delayed thermal response will be more noticeable if heating e.g. the central cable but how would more heat be required without breaking energy conservation? Re part of your post I edited out without reading properly..... After the above I noticed you were implicitly comparing a sheath with heater wires (direct sheath heating) to a sheath with no heater wires (cable heating). If the sheath has good thermal conductivity no significant difference; if not, adding the wiring (but not the power) to the sheath would give similar results from the thermally conductive wires. Getting a bit picky, if heating the sheath on the outside, the wires will be somewhat hotter than the sheath; some heat will be radiated from these wires and never heat the sheath while with cable heating, all the heat is radiated from the sheath. Which is more 'efficient' isn't obvious..... * Personal experience - I am not employed by the Scottish Tourist Board.

If you want symmetric heating at 100% efficiency, use the central strand or all strands.... Or ... You don't have to heat the sheaths, you can heat the cables, whichever is more convenient. If you're zapping the cables with say 10MW, all that heat leaves the cables via the sheaths. Typical advert at https://www.eheat.com/envi-high-efficiency-whole-room-120v-hardwired-electric-panel-wall-heater-2nd-generation-hw3012t/ : I'd like to see the comparison heater which produces less heat with the same input....

Do the math: Pre-WW II farming was essentially "organic"-- the best yields were 50bu/ac for corn. Today, corn belt farmers get 200bu/ac-- ain't enough cow dung and Rhizobium to produce that. US population before WW II ~130M; today it's 330M....We've been swimming hard against the current all these yrs and can't stop now or we'll get swept away. To go organic on a large scale would result in a large change in the carrying capacity necessitating a commensurate die-off. ...Any volunteers? Total irrelevance. I didn't suggest going organic. You should read my posts rather than guessing. I did look at your earlier posts. All your refs to premodern ag were unsustainable e.g. Destroy the land's fertility then move on. That is not even intended to be sustainable farming. Maintaining the pasture's nitrate content etc by crop rotation or otherwise would have somewhat reduced the short term yield. If you meant 'not using inorganic N fixed by the Haber-Bosch Process produces a lower yield' you should have said that, not claimed that sustainable farming was impossible before Haber-Bosch How about the Atlantic northwest cod fishery? Cod was still cheap enough to continue fishing at 1%. Despite occasional subsequent (over)fishing there are signs cod is at last recovering. e.g.

You seem to be saying technology should be used to save us, and it won't save us.... Cannibal humans couldn't be a problem for long. Trump has adopted the 'more is better' approach in some ways, such as encouraging the use of fossil fuels while building barriers to protect his golf courses from rising sea level. From https://www.usnews.com/news/world/articles/2017-12-22/trump-resort-in-ireland-will-build-seawalls-to-protect-against-climate-change And a not very high tech fix to make nuclear weapons much safer to use.... From https://www.theguardian.com/world/2020/jan/29/us-submarine-trident-nuclear-warhead-patrols-atlantic-ocean Perhaps they learned from 'Doctor Strangelove' that secret deterrence was unwise. Potential targets might also learn from 'Doctor Strangelove' and decide to add cobalt jackets to their nuclear weapons and create fail-deadly devices. Things have got more complex since 'Doctor Srangelove' and it would be unfortunate if that military officer attacked a country with fail deadly devices because the president thought they were bluffing. No doubt reviving Reagan's star wars initiative would again make the world safer.... Exactly. Never heard of crop rotation? Worked fine in Britain from the last ice age until artificial fertilisers were invented. Britain ran out of West long before America did.

Can't resist.... It's arguably more significant that LIGO with VIRGO provide strong evidence that there's no such thing as gravitiferous aether.

I thought the answer was 'yes' until you asked the question. On reflection I think the speed of light is the (unachievable) upper speed limit for propagation of information. Semi classically, infinite bandwidth (i.e. no fuzziness) would be required for light speed propagation of information. (Alternatively, Heisenberg UP could be invoked.)

Strange concept of extinction. Imprison animals or humans in an unsurvivable 'utopian' prison and they'll 'become extinct.' By that definition, I guess technology, or lack of it, will cause every human now alive to become extinct in a hundred years or so. An example of how all of humanity can become extinct without very high tech help would be good.

It appears that a single droplet of water can generate 50nC at 140v i.e. 7 microjoules. And a litre of water/second falling from 15cm can generate 70mW. I suppose that's about 1.5W of kinetic power so the efficiency is quite impressive.

The human species is incapable of self annihilation without technology. The current approach of using technology to ameliorate the harm caused by other technology seems a bit illogical.

He's one more turtle than I could think of, and now she's suing me for failing to create her. Fortunately I have a £1 million bank loan backed by a foundational sub prime mortgage.

As long as the turtle at the bottom doesn't think about what he's walking on, everything should be fine.

If something exists and there has to be a creator, then the creator also has to have a creator etc. Turtles all the way down.

Use Maxwell's middle hand rule to determine the sign of the exponent. Exponent size is just a matter of adding or subtracting something ... etc. Ultraoversimplified.....

Possibly. Never tried that. I think it would have to be bright enough to cause pupil contraction and perhaps be too bright to look at without discomfort.

You could try looking at a bright light bulb. In a lucid dream it always looks dim to me. I suspect it's because I can't create the physiological effects of a bright light.

An extreme example: I didn't kill that child in a hit and run. There's evidence the police overlooked which will prove I was robbing a bank at the time. Almost(?) everyone has something, lawful or not, that they don't want generally known and might withhold even if it would be evidence of their innocence of the crime they're charged with. Trump in particular must be concerned about other offences coming to light if witnesses are cross examined under oath. They seem to be claiming he is innocent however dubious their reasoning. So he is not guilty until and unless found guilty. It should be, but for some senators who decided their verdicts before the trial, facts are irrelevant.