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Showing content with the highest reputation since 02/05/21 in all areas

  1. Hello all -- I hope you are doing well in these odd times and keeping safe. This morning I've applied an update to our forum software, which obviously brings a few visual updates and changes in comparison to the older version. This was necessary to ensure we stay up to date with the latest security features and patches. However, from a functionality perspective, I believe this will mostly remain unchanged. Please do let us know in this thread if you have any issues with the site, and I'll continue to monitor the site for problems.
    4 points
  2. Comparison of mass of living organisms on the Earth:
    3 points
  3. I wanted to share this brief 9 minute video presentation, mainly for its unique approach regarding international space agreements, but it's also a great overview showing many of the various actors and institutions currently involved in trying to hammer out some rules regarding orbital debris and other problems facing us in the space around our planet. Very interesting research, and a crash course on what's happening in orbit.
    3 points
  4. Just shared a lecture with a Nobel prize winner. Feels weird.
    3 points
  5. @Abhirao456 You may be interested in this: https://en.wikipedia.org/wiki/Sokal_affair It's very much related to what @iNow's point.
    3 points
  6. Pre 18th Century, Sailing was a risky business, with only being able to determine one's position by Dead Reckoning and Latitude. While Latitude could be readily calculated, longitude was unknown with no means to determine, once out of Land sight. Sailors pre 18th century would follow known Latitudes until reaching a familiar land form. This was called "westing" or "easting" depending on the direction sailing, and would have been the method I presume that Columbus made, when reaching the Americas. The latest time machines of the day, pendulum clocks, were obviously useless at sea, due to
    3 points
  7. Slightly less useful; you couldn't even fertilise the rose-beds with it.
    3 points
  8. 1) How did "coal", which is by definition, fossilized organisms, exist before organisms? 2) How did viruses, which by definition require cellular hosts to replicate, replicate before the existence of cellular hosts? 3) SARS COV 2 is a recombinant derivative of two ancestral coronaviruses, with approximately 20 years of evolution between it and its nearest known relative. Conversely, tailed bacteriophages have been on earth for approximately 4.5 billion years. 4) SARS COV 2 arose through the recombination of disparate coronavirus strains and infected the respiratory system of
    3 points
  9. Just after Thanksgiving, I finally updated my 7+ year old computer to a new "gaming"* computer. This has allowed me to upgrade Blender to the latest build, which has a number of new features and tools, as well as driving the render times down significantly. For example. One of the Star Trek matte paintings I tried to duplicate with Blender was of Stratos, the cloud city. While modeling the buildings wasn't that difficult, the clouds became problematic. In order to get the right look, you had to create a light scattering volume. This means that the render engine has to take into a
    3 points
  10. If I understand correctly, you're presenting a position that correlates genetically based racial distinctions with variations in brain size that confer variations in intelligence. Let's start with the genetics, which does not confer intelligence unless their expression result in malformations that inhibit normal or average brain development or function. Homo sapiens, as a species, share a commonality of brain development, structure, and function that may only be altered invitro or after birth as a result of nutritional, environmental, or social influences and effects. What I'm stating here
    3 points
  11. Thanks Joigus, when you haven't got a grounding in this type of thing (like me) it's all a little mind blowing, but i'm going to keep looking and learning. And ill keep asking questions to try and get some understanding. Thanks again
    3 points
  12. Just to build on what has already been said. "Everything" is not moving away from each other. The atoms making up the Earth aren't, The planets are not moving away from the Sun (or at least not due to reasons tied to universal expansion), the stars in the galaxy aren't flying apart... All these structures are held together by interactions that are much stronger than universal expansion.* Our galaxy, along with Andromeda and a few others are part of a local group bound together by mutual gravitation. Our local group is one of many in a larger cluster. You have to go to scales beyond
    3 points
  13. There are a number of genetic causes of intersex individuals, some of which render the physical attributes of the individual to be discordant with their underlying genetics (e.g. AIS resulting in XY individuals with undescended testes and a vagina, or CAH resulting in XX individuals with masculine traits). I imagine that these conditions - typically with frequencies of one in thens of thousands might contribute to discrepancies in the designation of biological sex at birth.
    3 points
  14. No, it means that if the OP was somewhat difficult to address, then your post is a complete disaster.
    2 points
  15. If the existence of 'being' is in question, for how many of those fancy words you are using is the existence of their meaning in even greater question ? 🙂
    2 points
  16. Well, yes but: (my emphasis) Also: (my emphasis) Also: This recurring point is what I mean by off-shell. Can you address any of these questions? You can get all kinds of weird things by adding 4-vectors, one pointing to the past light-cone, and another pointing to the future light-cone. You can obviously get the 4-vector, \[\left(u^{0},\boldsymbol{u}\right)+\left(-u^{0},\boldsymbol{u}\right)=\left(0,2\boldsymbol{u}\right)\] But that's unphysical. That's what we're trying to tell you.
    2 points
  17. Hopefully, you enjoy yourself and understand something better. I'm just going to focus on the use of this forum. Others have spoken in more general terms about the history of developments in Physics. What's the point of the general public discussing (and replying to) ideas in this forum? 1. It may be that you realise why things can't be the way you thought - but that is not to be thought of as a negative thing ("oh, I was wrong"). It is progress and development in your understanding. 2. It may be a practical benefit. For example, getting the right temperature of light bul
    2 points
  18. Is not a problem with the forum nor anyone here. Everything right here. Is just that there are too much things to be questioned at the same time. Everything is interconnected someway in Physics, I know. Too much things to handle at the same time. The point is that I can't manage that. Same problem I would have in any other forum. It's a problem of mine...
    2 points
  19. I doubt it very much Beecee. The current Pope was trained as a Chemist, and worked in a lab ( as well as a bouncer in a club ). Previous Popes have been Mathematicians and Astronomers. Galileo was an exception; the Vatican, and the Roman Catholic Church, have a long history of supporting the Sciences. Church has long history of supporting science - Vatican - Chicago Catholic As for Prof Reza Sanaye ... What, exactly, are you a Professor of ? Obfuscation and confusing use of the English language ? And who is the wide-eyed crazy guy in your avatar ?
    2 points
  20. I am interested in solitons models of particles for more than a decade, some slides: https://www.dropbox.com/s/aj6tu93n04rcgra/soliton.pdf As particles, topological solitons can stay in place or travel - getting SR effects while approaching propagation speed, like Lorentz contraction, time dilation (e.g. for breathers), mass/momentum scaling. For example resting and traveling kink of this mechanical realization of sine-Gordon model:
    2 points
  21. Ok, but the problem then is that such a universe would not permit any (tidal) gravity in the vacuum outside of massive bodies. This is contrary to both observational evidence in the real world, as well as Maxwell’s equations. All of these, and many many more. But you are getting this backwards, because, since you are the one proposing a new idea, it is up to you to show experimental evidence that there exists electromagnetic radiation that propagates at v > c. This is simply not true. The EM wave equation follows directly from Maxwell’s equations, and its solutions
    2 points
  22. https://www.bbc.co.uk/news/in-pictures-56016031 Interestingly there are a couple of photos about the use of solar power in the list and also several other environmental science subjects.
    2 points
  23. Not a single useful rule to be applied empirically have I found there. Nor a single useful rule to be applied in an explanatory way. Many pompous words, that's all. You should have to find an expert in cosmogony, the mind, matter, ethology, and what not, to be 100% sure whether he's making any sense at all. For the time being, I will stick with other's opinions that it's mostly word salad. Just to clarify, I'm not a professional theoretical physicist, although I've had all the training, and keep up-to-date reasonably well. But my approach is very much on the mathematical/conceptual
    2 points
  24. I've not run across these terms before. The Google results for them suggest they are made up.
    2 points
  25. No. There's no physics there, just some terminology tossed together, devoid (as far as I can tell) of any real meaning.
    2 points
  26. I don't see any physics in there. It's word salad.
    2 points
  27. Comes from the Nitrogen mainly. https://en.m.wikipedia.org/wiki/Ionized-air_glow You have an... interesting.. idea of 'fun' lol. Kills me visiting relatives up North during the winter.
    2 points
  28. Almost every one of your statements is easily refuted. I've chosen one at random. Thousands of meters below ground the rocks have significant porosity. The pore spaces are typically filled with sea water. Why would the viruses and bacteria be unactivated?
    2 points
  29. According to the 20th Century humourist, former Presbyterian and balding Liberal Democrat, Area54, "All nonsense passes through three stages: First, it is conceived by a fool. Second, it is laughed at with disdain. Third, it is dismissed with a tinge of sadness for its author, the victim of Dunning-Kruger effect.
    2 points
  30. I walked into a coffee shop one day, where some guys were having an interesting conversation, so I joined in the conversation. I got something out of it, and I gave something back. I've since returned to this coffee shop every day, met the same people, and had interesting coversations/discussions about many subjects; as long as I keep getting something out of the discussions, and my imput is welcome, I'll keep coming back. Why should I care who originally built the coffee shop, or what its intended purpose was ? Don't overthink it; it's just a discussion forum.
    2 points
  31. Wow. That was much more exciting than I expected! And on a side note, it was nice to see a room that was not dominated by white males. 😃
    2 points
  32. ! Moderator Note We've been down this road before, and you have nothing new to show us, it seems, so you use these shitty, fallacious, bad-faith tactics to discredit your detractors, rather than analyzing the science they're bringing to the discussion to refute your racist agenda. Staff has decided we're going to treat this genetic superiority subject the same way we treat discussions about creationism. We just don't bother with such lunacy. If it looked like you had ANY interest in overcoming your current genetic ignorance, we'd be happy to discuss the topic w
    2 points
  33. I agree. It’s been amazing watching all those republicans who voted to impeach Trump get censured by their local state governments, and Trump attack McConnell saying it was critical to end his political career because he made a speech which failed to show sufficient submission and fealty, or who have abandoned Fox News for having the audacity to call the state of Arizona for Biden during the election, or fleeing Facebook for Parlor for having the audacity to fact check posts claiming to be news, or boycotting Nike for presenting an advertisement featuring Colin Kapernick, or any of the countle
    2 points
  34. Good post, DrmDoc, and you take it back to the OP which/who has slipped away from the OP's initial presentation to one more based in sociology (as the more recent postings would suggest). Which, IMHO, is more pertinent the thread's title anyway. Because I've seen little but bias involved in any evidence correlating intelligence capacities with race. But the sociological evidence is overwhelming I would like to add that, with respect to brain size, the development of the number of neurons in the neocortex is far more important than brain size. If it wasn't for that, I would be pulling term
    2 points
  35. There is a real sociological danger when one pursues equating race to some degree of perceived Human imperfection. Personally, I'll have no truck with such concepts. So....done here.
    2 points
  36. What did they perform PCA on? Presumably some kind of genetic dataset? The problem with this kind of dataset is you can similarly label jockeys and basketball players on a and get a visually appealing separation. Does this mean there is a difference between these two types of sports people such that you want to call them different races? You could. What is 'biologically real' is to an extent based on how we choose to categorise things - apparently even the concept of species gets murky at some point. So i guess the question is whether treating race as 'biologically real' is useful. Race a
    2 points
  37. Quite a lot. The WHO has played a leading role in several public health achievements, most notably the eradication of smallpox, the near-eradication of polio, and the development of an Ebola vaccine. Its current priorities include communicable diseases, particularly HIV/AIDS, Ebola, COVID-19, malaria and tuberculosis; non-communicable diseases such as heart disease and cancer; healthy diet, nutrition, and food security; occupational health; and substance abuse. https://en.m.wikipedia.org/wiki/World_Health_Organization You seem to be confusing the World Health Organisation for th
    2 points
  38. Why Pythagoras almost destroyed the world! And think of the trouble learning to count has caused!
    2 points
  39. It mean's what the feck, as in what father Ted says (and he's a catholic priest), what do you think it means?
    2 points
  40. “O, wad some Power the giftie gie us To see oursels as others see us! It wad frae monie a blunder free us, An' foolish notion.” Robert Burns, Scottish poet and socialist 1786
    2 points
  41. No, they come to the conclusion that you're a little off. At least I did. Likewise brook, which has a different connotation in standard English, meaning "to stand for or tolerate." As in, "He brooks no difference of opinion." You give the impression of playing games with your own internal language, which detracts from whatever you're trying to say.
    2 points
  42. Thank you, it sort of makes sense now. please forgive my ignorance.
    2 points
  43. It would seem to be that however small the risk might be it is not insignificant since the BBC recently highlighted cases of misdiagnosis and I find on looking for them that there is an american standard on the subject. https://pubmed.ncbi.nlm.nih.gov/25944182/
    2 points
  44. I'll take a run at this. I think the key issue is that there is no completeness theorem for second-order logic. In general the OP's post doesn't mention the key distinctions between first and second order logic. OP should give this a read, perhaps there is some insight to be had. https://plato.stanford.edu/entries/logic-higher-order/ In particular, note section 5.2: "We shall now see that there is no hope of a Completeness Theorem for second-order logic." Ok, that's a funny way of putting it but I know what you mean. Ok. But you are conflat
    2 points
  45. Yes. https://pubmed.ncbi.nlm.nih.gov/7597195/
    2 points
  46. Sorry about your friend having to pass, mate. I’ll tip a glass your way later this evening.
    2 points
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