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John Cuthber

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John Cuthber last won the day on November 16

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About John Cuthber

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    Chemistry Expert
  • Birthday 11/10/1965

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  1. The word Clinical has a similarly odd origin. It means bedside. It's related to words like recline and incline. It also ties in with geological "beds" as in syncline.
  2. 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?
  3. The best street lighting is probably the one that gets the local politician re-elected at the lowest cost.
  4. I take it that you understand paraphrasing https://www.theguardian.com/us-news/2019/nov/06/trump-impeachment-inquiry-ukraine-testimony-bill-taylor
  5. 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 " ?
  6. Are you aware that two wrongs don't make a right?
  7. 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. 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."
  8. Yes,. 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.
  9. 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.
  10. 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).
  11. You don't understand how science works.
  12. 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.
  13. There are a couple of bits of the human skeleton which are not "attached" to the rest. IIR|C the hyoid bone is one. So, in a model skeleton, it needs a "bridge" of some sort to hold it in place. There would need to be some way to distinguish that bridge to make it clear that it's not a bone. Making it red would be one possible option.
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