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John Cuthber

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Posts posted by John Cuthber

  1. 45 minutes ago, Arnold Ungab said:

    1. i can send random messages to a person and the person heard it, that includes words numbers and symbols.

    Either you are wrong, or you are wrong.

    Either you can send these messages to people, and they tell you what they "heard" or they don't.

    If they don't then you are wrong to say ". i can send random messages to a person and the person heard it, that includes words numbers and symbols.".


    On the other hand, if you can send those messages then you are wrong to say that you can't find experimental volunteers because the people who tell you that they "hear" your messages are experimental volunteers.


    Chose a story , and stick with it, or just leave.

    9 hours ago, Arnold Ungab said:

    I'am not confused, mentally ill or insane

    If that's true, and yet you are saying things that contradict eachother then you must be lying.

    However, here's a simple experiment for you to try.
    Go for a walk through town of go + hang round at the bus station or some such- anywhere that you can find plenty of people.

    Wear something slightly unusual- a red coat or something.

    Telepathically send a request to anyone who passes you saying " Ask the guy in the red coat what the time is".


    Now I accept that some people who "get the message" will ignore it but it's hard to imagine they all will..

    Try this experiment for a few hours  over a few days and come back to us to let us know if anyone actually asked you the time.


    Once you have enough data - say a dozen people asking you the time,- repeat the experiment, but this time send some other message and see how many people ask the time anyway,- just to establish the background rate.

    If you are really telling the truth, you should be able to confirm it in an afternoon.


  2. On 11/21/2019 at 9:46 PM, mistermack said:

    So, in your view, the evolution of dogs started with domestication? I think you'll find that it goes back millions of years before that. 

    Which variation of stupid are you being?
    The evolution of dogs and people started at the same time since (like all mammals) we have a common ancestor. That invalidates your claim that our pet dogs have had longer to evolve than we have.

    And you said "pet dogs" and they only became pet dogs after we started petting them. That invalidates your claim that our pet dogs have had longer to evolve than we have.

  3. 3 hours ago, Arnold Ungab said:

      i would like to test that theory but the sad truth is there will no more willing participants in the exercise. 

    Are there any homeless people where you live?

    How about students or bored housewives?


    This idea that you can't find  experimental subjects is daft.

  4. 1 hour ago, mistermack said:

    We simply haven't got the long period of evolution of surviving chills that our pet dogs have, 

    We have been around for longer than pet dogs.It kind of follows from the definition of "pet".


    And "Where the domestication of the dog took place remains debated, however literature reviews of the evidence find that the most plausible proposals are Central Asia, East Asia, and Western Europe. "


    So, that's plainly after we left Africa.

  5. "for copper electrorefining is 0.0 V. In practice, overvoltages at the anode and cathode and the resistance in the electrolyte and electrical system result in the need for an applied voltage of approximately 0.3 V. "



    Or 0.15 to 0.3V from


    I recognise those are for copper, but silver's not that different. 

    So the energy use is roughly  a tenth of what you said.
    0.02MJ / mole

    Now a MW Hr of (domestic) electricity is 3.6GJ and costs- as you say about 150 Euros

    So that's 4 cents per MJ

    So the electricity cost is 0.02 MJ/ miol times 4 cents per mol which is 0.08c per mole

    Roughly 10 moles to the Kg

    so the electrical cost is about  1 cent per kilo or about 10 Euros per tonne. Today's price is about 500 euros per kg or roughly 500,000 per tonne.

    Essentially, unless you can recover 90% or so of the energy that you put into evaporating the metal, it's not worth it

    Electro refining at about 0.02 to 0.05 MJ / mole is going to be cheaper than boiling at 0.3 MJ/ mole, even when you allow for gas being roughly a third the price of electricity (on a J per $ basis)..

    On 11/16/2019 at 3:47 PM, John Cuthber said:

    Good luck making it cheaper than electrorefining.

    Running it in a stream of argon means you also spend energy heating argon.


  6. 2 hours ago, StringJunky said:

    Apparently, you can also stumble on stairs that have a step that is different to the others in height.

    Unless you expect it.

    Castles were built with staircases with an "odd" stepp in them to trip enemies who were climbing the stairs.

    I learned about this interesting fact in a talk about the safety of modern stairs where , as they pointed out, badly made stairs are still killing the unwary.

    Here's a trivia question for you ( the answer is at the end of the post)

    Roughly how many people are killed by falling on stairs each day in the UK?


    Interesting fact for the day.

    If you have a staircase where the steps are uneven you can always make it even by adding planks (of various thicknesses) to the steps.

    This is an important result because adding to the treads is easy but taking stuff away is hard.
    It's also (I think) always possible to make all the steps the same "length" as well.
    So there really is no excuse for badly built stairways.

    (About two, btw- did you guess right?)

    On 11/19/2019 at 3:21 PM, iNow said:

    It does go to the brain. Our processing speeds aren't instant, but they are quick enough to account for this... on the order of a few hundred milliseconds. 

    Our brains are pretty good, but we often rely on reflexes which don't use the brain. 
    I'm not sure which category this phenomenon falls into .

    I'd be interested in finding out.

    I'd be even more interested in knowing how they found out.

  7. Anything we can do an asteroid can do better; an asteroid can do anything better than us.

    Seriously, the gravity well of taking something away from Earth is so expensive in energy that it will make sense to get any element from somewhere smaller more or less regardless of how common it is.

  8. 5 hours ago, Janus said:

    While there is an argument for putting one more color beyond blue, Newton's reason for adding 2 had to do with his religious belief that the number 7 held a special significance. 

    True. (And, personally, I think he should have gone with turquoise or peach as the 7th. Who  seriously thinks indigo isn't blue?)

    The important point is that 1 exceeds zero.

    On 11/19/2019 at 8:11 PM, John Cuthber said:

    'blue' is next door to uv

    is just plain wrong regardless of Newton's numerology

  9. 23 hours ago, StringJunky said:

    The trouble is 'blue' is next door to uv in the spectrum and some blue LED's can produce uv. What's to say it's not that part of the blue LED's emission range that's causing the phosphors that give white to glow? I've tried looking at emission ranges and some bleed into sub-400nm.

    Newton would disagree, having put indigo and violet in the space between blue and UV.

    There's undoubtedly some  light produced below 400nm, but not very much.

    And, for what it's worth, 400 nm is visible. The exact "start" of the UV is rather poorly defined.


    But your implication is that the designers chose a phosphor that only works "by accident".

    Not only that, but there is direct evidence that the phosphors absorb  visible (blueish) light.

    Have a look at a white LED when it's not running.
    It looks yellow.

    Do you have some extraordinary evidence?



  10. 30 minutes ago, J.C.MacSwell said:

    Here's the question; Since what Hunter Biden was doing was obviously suspicious, making it reasonable for Trump to ask for it to be investigated, is Trump obligated to not ask to have it looked into due to the fact Joe Biden is a main political opponent?

    The counter argument would be that corruption in Washington is so rampant that the level of influence peddling as seen or perceived by the Biden's is never questioned, and so asking for investigation is clearly motivated solely by political motivation.


    Kind of misses the point.
    It's reasonable for Trump to say "You should look into this"

    It is not reasonable for Trump to say "You should look into this  or I will withhold US government support for your country"

    Do you see the difference there?

    Have you missed all the references to "quid pro quo or did you not understand them " ?

  11. Higher beef prices are not a vote winner.

    It is, in principle possible to split

    antibiotics into two groups- those used in humans and those used for animals, but it's an imperfect solution.

    On 11/15/2019 at 4:55 PM, CharonY said:

    but so far not alternative golden bullet is really in sight

    If we found it, there would be immense pressure on doctors pressure to screw it up in the same way we did with penicillin etc.


    I'm intrigued by the idea of using phages, though I recognise that they suffer from essentially the same issues.

    One thing that would help would be if doctors had the freedom to prescribe placebos or to be more honest to their patients.

    Mr Smith "Dr I have a cough and I'd like something to treat it.
    Dr "Sure, here's a prescription for some cough syrup " (while writing out Rx for "simple linctus" which works just as well as anything else and costs  the NHS about a pound per gallon).
    Mr Smith "is it an antibiotic?"
    Dr "No, but there's a nine out of ten chance that your cough is viral and so an antibiotic would be useless. On the other hand, there's about a 1 in 3 chance that the antibiotics will upset the natural balance of bacteria in your guts. So, overall, an antibiotic is about 3 times more likely to give you the s*Its than to do any good."


  12. 17 hours ago, StringJunky said:

    Is visible blue energetic enough?


    I invite you to consider, for example, the workings of a "white LED" where  an LED actually emits blue light and some of this is down converted to the rest of the visible spectrum by some sort of phosphor.

  13. Good luck making it cheaper than electrorefining.

    In theory the voltage required for electrorefining is near zero; the electrolyte is reusable  and the process happens near ambient temperature.

    Also, there's not much demand for pure silver. YOu can reuse the alloy as it is.

    What you need is a cheap simple way to turn pure silver into the alloy.

  14. 1 hour ago, StringJunky said:

    OK, but then you'll alter circadian rhythms of plants and other organisms in the vicinity. Someone needs to invent full colour night vision goggles. :)

    But in the centimetre range or two an  LED will cause a glow in the dark object to glow. What wavelength is causing that?

    How have you ruled out blue?

  15. 42 minutes ago, StringJunky said:

    Air probably and being of low emission level but it is there..

    Air is transparent to any wavelengths of UV that would escape the plastic package of an LED.

    Incidentally, as far as I can see, nobody has mentioned purchase and running costs (except, arguably, Dimrepr).

  16. 1 hour ago, Joduh said:

    Right.  I think you are a machine

    I came up with that all by myself!  Postulated the results, did the test and you passed with flying colors.  one hand

    Guess that's life in "Speculations"

    You don't understand how science works.

  17. It's an interesting idea.

    Imagine that some state decided that you could get the "right" answer by saying " my religion tells me so".

    Imagine the pupils  studying and passing exams under those conditions.

    And then imagine them looking for work.

    Employer " I see you sat your exams in such and such a state"

    Candidate "Yes, that's right"

    Employer- "That's the state where you can pass exams by getting the wrong answer, isn't it?

    Candidate "Yes, that's right"

    Employer " Next candidate please".

    Now, I think that most students would recognise this problem quite quickly and would actually object to any such absurd legislation.

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