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John Cuthber

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Everything posted by John Cuthber

  1. The best street lighting is probably the one that gets the local politician re-elected at the lowest cost.
  2. I take it that you understand paraphrasing https://www.theguardian.com/us-news/2019/nov/06/trump-impeachment-inquiry-ukraine-testimony-bill-taylor
  3. 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 " ?
  4. Are you aware that two wrongs don't make a right?
  5. 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."
  6. 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.
  7. 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.
  8. 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).
  9. You don't understand how science works.
  10. 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.
  11. 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.
  12. Science makes progress by trashing ideas that don't work. If you are not happy with that, try another field.
  13. Manuka honey is a very very expensive way to buy sugar containing variable traces of nothing-special antimicrobials. Why not just go to the local supermarket or pharmacist where they stock a wide range of antibacterial products that are known to work reliably? Some are even perfumed with essential oils. Why specify "natural". Natural does not mean "good" or "safe".
  14. Honey is an expensive way to buy sugar. High concentrations of sugar will stop many or most bacteria- because there isn't enough water for them to thrive. However, that's not going to work well as a hair product- it's too sticky.
  15. No. Everything is toxic; it's a matter of dose. Also why is your text in pale grey on white?
  16. Yes it does. I have a dead soldering iron bit which says that it does... Also http://www.farnell.com/datasheets/315929.pdf Lithium / lead alloys (which have seriously different sized ions) are being considered for use in nuclear reactors. The only way to find out if lanthanides attack tungsten is to try it.
  17. It's an interesting idea. Even if you just split them into a few groups- high boilers, medium and low, you might make a second step so much easier as to be worthwhile. I'm pretty sure they will react with carbon. I suspect that you are near enough to the melting points of all but the most refractory metals that they wouldn't have the mechanical strength to build vacuum chambers from (unless you happened to be on the Moon).
  18. Stuff that's not digested by the intestines leaves by a different route. Calcium ions will form a solid precipitate with, for example, phosphate. Calcium phosphate can form kidney stones (and also bones). It is still calcium in the form of ions. Calcium metal reacts instantly with water.
  19. The problem is that you have not stirred the soup adequately. The requirement for a more or less fixed temperature while it melts is that the ice and water are in thermal equilibrium. That requirement is not met here.
  20. It's an interesting topic where stating something is on topic, but explaining that the statement is wrong is off topic.
  21. I never said it was. I said CaCO3 dissolves in the acid in the stomach- it does-and I said that the calcium is absorbed- it is. I never said where it was absorbed so...
  22. Religion(s) tried to pretend that we were the centre of the universe and that other religions were so wrong they were evil and should be killed for it.
  23. Calcium carbonate which enters the digestive system will usually react with the HCl in the stomach. It's famous for it. https://en.wikipedia.org/wiki/Antacid The resulting solution of calcium ions will be absorbed.
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