1. ## MigL

Senior Members

52

6408

2. ## iNow

Senior Members

51

22133

3. ## joigus

Senior Members

35

1553

Moderators

31

45652

## Popular Content

Showing content with the highest reputation since 11/04/20 in all areas

1. 4 points

## How Trump Could Steal The Election

Hillary called Trump to concede on the same night as their election and their race was FAR closer than this one with Biden. Barrack Obama invited Trump to the WH a day or 2 later and made his entire team available to the incoming Trump admin to maximize their chances of quick success. Essentially every democratic leader and person with a national profile acknowledged Trumps win and congratulated him on his victory both privately and publicly. Nothing anywhere even remotely close to this has ever once happened before since George Washington as our very first president ever transitioned power to John Addams. Let’s not pretend for even one second that this is somehow a both sides issue.
2. 4 points

## Political Humor

Recognize anyone ?
3. 4 points

Lol...
4. 4 points

## Political Humor

Salute to 2020 Ice Cream Flavour:
5. 4 points

## The Official JOKES SECTION :)

Translated by me from https://www.socomic.gr/en/2018/01/kourafelkithra-socrates/
6. 3 points

## Ancient Science (Babylonian period and prior)

He said on a computer plugged into the internet... 🙄 What happened, you run out of stones?
7. 3 points

## Barriers to equal opportunity in education

! Moderator Note Vague generalizations disguised as slurs towards a group of people are against our rules. This sort of thinking has been debunked MANY times over, much like creationism and phlogiston, so we don't waste our time wallowing in such ignorance. If you persist in this, you'll be required to leave. Nobody here is interested in going backwards; discussion should be meaningful, and promote learning. IOW, stop making moronic monkey noises.
8. 3 points

## Barriers to equal opportunity in education

It is OK because it identifies those who are impacted. It makes no sense to say blacks were hurt but we cannot help them because they are black and therefore we cannot identify them. If only the black people in my neighborhood were exposed to a disease, do I also have to treat all of the white people just so that I'm not sorting according to race? If we applied your logic to tornados the insurance companies would not have to pay anyone with a claim because that would require us to sort based on the criterion of 'damage'. It is self evident that the criteria you use is the one that identifies who is impacted, whether that is damaged homes or race. You said previously that is was okay if it was used for good (see below). Now you are saying it is not okay. Did I miss something?
9. 3 points

10. 3 points

## New interpretations of physics that lead to experiments

Because Star Trek is science fiction.
11. 3 points

12. 3 points

## Copenhagen Interpretation?

I agree with you, basically, that the Copenhagen interpretation is not satisfactory, and neither it is the many-worlds interpretation. But the Copenhagen interpretation works like a dream. That's the problem, actually. It works like a dream and mathematically, it cannot be the whole story. As Bell said, Copenhagen's interpretation is good FAPP (for all practical purposes.) As Bell also said, Mind you: He didn't mean classical-mechanical arguments; he meant quantum-mechanical arguments. I'm working on a miniature of explanation in 2-dimensional quantum mechanics, if you're interested. The many-worlds interpretation is not a corollary of the Copenhagen version. It's more like what @Sriman Dutta says: I totally agree with this. Conjugate variables are certainly peculiar. Their properties cannot be simulated by any finite-dimensional space of states and thereby cannot be completely understood with discrete mathematics. They are the domain of transcencental mathematics. Unlike the famous $$J_x$$, $$J_y$$, $$J_z$$ that people use in all the completeness theorems, they always pair in couples, one of which is conserved, the other is not.
13. 3 points

## Brain in a vat hypothesis

We don’t fully know since it’s not currently possible to keep a brain functioning and healthy once it’s fully severed from the body that grew it. Whether you put it in a vat or an entry bag of Cheetos, this is all hypothetical. Keep in mind, however, (no pun intended) that the brain doesn’t really care about the actual interaction of atoms (as you call it) that occurs when a touch happens between the body and something out in the world. All the brain cares about is what nervous signals are arriving to its various parts, how intense those signals are, the duration of the signals, and in what order those signals arrive. This information is then all combined to form a “narrative” describing the event in our conscious mind... the part we generally consider to be the self... the “me” behind the eyes. So something presses against our skin. This change in pressure causes certain receptors to activate, and those receptors trigger a cascade to the receptors around them (nerve cell 1 activates nerve cell 2, and nerve cell 2 then activates nerve cell 3, cell 3 activates cell4, and on and on all the way up the spine until the signal finally arrives to our brain...then some new signals cascade throughout the brain much like ripples travel across a pond after tossing in a stone). But that is all... the only thing the brain “sees” is that a specific change in voltage happened at a specific nerve cell or set of cells. It’s only later once those incoming signals have been put together that the brain concludes that this thing which just happened was a touch... it then compares it against previous touch experiences to determine specifically what touched us etc. Following this same logic, you could theoretically send a signal to your brain in a vat separately. So long as that signal being sent to your severed brain mimics the signals sent to the brain from the body, then we can likely assume it would be perceived as a touch no differently than touches get perceived today. You’d clearly need to tune the signals like musical instruments in a symphony to achieve the right “sound” and there are lots of assumptions embedded here (like the fact that we’re successfully keeping a functioning brain in a vat somehow), but that’s my take. Hopefully it gives you some food for thought.
14. 3 points

## Why is there no forum for (insert field here)?

Many historical 'facts' are contested and debated by historians. Things like the cause of the fall of the Mycenaean civilization, which, along with Crete, comprised the 1st Greek empire, fought a war with Troy, and literally disappeared from the face of the Earth. Things like did the Roman Empire really fall, or did it just 'absorb' invaders and convert them to the Roman way of life and governance. Things like the cause and mistakes in execution of the 1st World War. And its contribution to the beginning of the 2nd World War. Things like Papal authority ( even over Emperors ) and the amassing of power and corruption by the Church, along with wars encouraged by the Church and the selling of 'Salvation' which led to splintering into differing 'sects'. Things like was the Vietnam War winnable, and more importantly, was winning necessary or of benefit. Things like the paradigm shift that brought about the Renaissance. How many did you want me to list ...
15. 3 points

## Is God visible!?

You assume too much. Shi'a and Sunni Muslims disagree about 'the roots': Who are the rightful heirs of Mohammed, and whether Al Bukhari was right about him and his doings, and probably many more things. I'm sure you know much more about it than most of us here do. It's a 'sources' problem (both about the authenticity of books and/or translations, and about the line of authority) very much like what was for Christians several hundred years ago in Europe between the many Protestant offshoots, and Catholics, and Jews. That led to unimaginable bloodshed between Christians and Jews. We know. Actually, we know much better than you guys do. We've killed each other, we've hated each other for so many more years. Most of us seem to have taken home the lesson. You, unfortunately, haven't. That's a very big part of the problem, guys. A part of your community seems unable to take home some lessons from your brethren religions that are much older than yours. Jewish and Christians being at each other's throats for centuries. You're still obsessed with a couple of lines in a several-centuries-old book. That's, allow me to say, pathetic. Both in the most ludicrous sense, and in the most tragic one. Take a look at Mandaeans, Yasidis, etc., and how they've become victims of unspeakable violence in recent years in the Middle East, just because they follow the rituals that their ancestors did. Probably with the same amount of doubt that you do yours. But also take a look at how some Muslims brothers die at the hands of each other because of a difference of opinion. And ask yourself: Is the interpretation of some lines on an ancient book worth the suffering that we see in the world? The suffering of a child is not worth ten thousand lines of a holy book.
16. 3 points

## Is God visible!?

I, for one, wish posts like these about god were less visible
17. 3 points

## Infinity has an end..

Infinity has an end? Infinity means many different things, depending on when it is used. The word is from a Latin word, which means "without end". Infinity goes on forever, so sometimes space, numbers, and other things are said to be 'infinite', because they never come to a stop. ... For example, adding 10 to a number repeatedly. Let me know when you reach the end...
18. 3 points

## How Trump Could Steal The Election

...and after January 20... plus they have to get him out of there:
19. 3 points

## Examples of Awesome, Unexpected Beauty in Nature

Volcanic lightning is hard to beat. https://en.m.wikipedia.org/wiki/Volcanic_lightning Calbuco, The Awakening.” ... Calbuco Volcano is located in the lakes region south of Santiago, Chile’s capital city and is one of the 10 most dangerous volcanoes in the country. After more than 40 years of inactivity, the day April 23 the volcano erupts, spewing more than 200 million tons of ash https://www.dailytelegraph.com.au/news/photos/national-geographic-photo-contest-2015/image-gallery/a2afa2087ecd4f4d62475d231b129e31
20. 2 points

21. 2 points

## Woodworking: Amateurs, Craftsmen, & In-Between

Built a chessboard for my daughters. Walnut and maple. Half lap joints held by pegs for the corners. Pleased with how it’s turned out
22. 2 points

## Alternative Interpretation (split from What is Space made of?)

[irony] Thank you teacher for marking my homework correct [/irony] I didn't say any of that. That is all your conjecture. Further I have no idea whether you understood what I said. In particular note the examples you have provided in the other threads are 2 dimensional, in which case the physical dimension reduces to the reciprocal of length. This is a far cry from volume, and is usually called wave number when dealing with waves. By the way this jumping about between threads discussing essentially the same subject is very wearing. If you wish to communicate (your ideas) with physicists it would be a good idea to learn some of the basics of the subject and language. It has taken a lot of great minds over many thousands of year to reach the stage of technology we now enjoy. During that process many ideas have been proposed and worried over doglike with a bone. quite a few of these, at firts promising, were finally rejected as unworkable or not in conformity with observation. So it is pointless and futile to try to invent all your own Physics by yourself. Start with what is already known, tried and tested, and move outwards and onwards from there. A simple observation, but so true in this case and such a good example of what I mean by my advice. It also provides a reminder to me to be more specific and accurate. Thanks, swansont. +1
23. 2 points

## Barriers to equal opportunity in education

You need to quit focusing on race. They are just fixing a problem they caused with a group of people. Could have been blacks, women, left handed people, or those whose first name begins with "M". Let's say your parents had four children, two boys and two girls, and only gave an allowance to the boys even though all did their chores. If the parents finally realized the error of their ways and decided to only give allowance to the girls until they are all caught up, would you call that sexism? You are forcing the situation into the definition of "racism" even though there is no discrimination, prejudice or antagonism directed at white people. Doing things based on race is not automatically racist. If you give a white person money one week, and a black person the next week, have you been a white racist and black racist on alternating weeks? Your argument is similar to the kid who kills his parents then demands pity because he is an orphan. You are setting up a situation where no one can ever be compensated for wrongs done to them because someone will always be hurt by the remedy. For example, let's say I own stock in Pfizer and Pfizer is sued because they don't properly test a drug and people die. By your argument, those victims should not be compensated because that compensation will depress the value of my stock holdings. It is you who are on a slippery slope.
24. 2 points

## Barriers to equal opportunity in education

This discussion of affirmative action being a type of racism reminds me somewhat of the paradox of tolerance where ostracizing others for being intolerant is described as itself being a form of intolerance.
25. 2 points

## Barriers to equal opportunity in education

I think you misunderstand AA. The government actively established and promoted a system where whites were favored over blacks. This resulted in a society where (generally speaking) whites have the money and the power, in a self-sustaining system that perpetuates a society where (generally speaking) whites have the money and the power. (i.e. Whites have the money and power to ensure their children get a better education and more opportunities than blacks, and therefore get the better jobs, more money, more power, able to pass that privilege on to their children, and on and on.) Unless there is some sort of change, this will continue indefinitely or only be changed at a very slow pace. So what to do? The government decided that they needed to start ensuring that minorities were able to get past the white privilege of money/education/power by ensuring they got a seat at the table, and were able to begin competing on an equal basis in society by getting the same education and opportunities (and thus power and money) and the whites have been getting all along. Once blacks are able to compete with whites on an equal basis to get their kids in the better schools, etc., this self sustaining system will then include whites AND blacks. Unfortunately as there are a limited number of opportunities, if you guarantee a spot for a black person, then someone who may be more qualified (or at least equally qualified) has to suffer. Is that fair to the white person who gets passed over? No, it is just as unfair as it was for the black person who used to get passed over. But this is not about individuals, it is about what is best for society. Basically the government said, "we screwed up society for minorities and are choosing a less than perfect option for righting the ship". So "In what world, then, does it make sense, that in the case of two equally qualified individuals the tie-breaker is determined by 'features' of whatever group is needed to fill a quota ?" Answer: In a world that screwed up society by favoring the "white" feature, and are trying to make amends by favoring the "black" feature for a while until things are the way they should have been without our interference way back when.
26. 2 points

## New interpretations of physics that lead to experiments

Coming back from death used to be fiction. It still is.
27. 2 points

## Kid Philosophy: What is the wisest thing you've heard a child say?

Tonight after our thanksgiving meal, we flipped through the channels and the scheduled American football game had been cancelled... replaced by a dog show which our 3-year old cleverly called a “dog Talent show.” That made us chuckle... how does a 3-year old know WTF a talent show even is, and how cute is it to label a dog show as one? But that was nowhere near as cute as how during dinner a few weeks back when speaking and searching for the word for “watch” this same 3-year old described it as a “clock bracelet.” My pride regarding these self-directed still forming descriptions of the cosmos around us is boundless.
28. 2 points

29. 2 points

## Where would you go?

Out there, just out there...
30. 2 points

## What is the Big Bounce and what evidence and arguments are used to support it? Or counter it.

Biggest problem with all versions of cyclic cosmologies is the fact that entropy has to be 'reset' to the low initial state. One mechanism proposed by R Penrose with Conformal Cyclic Cosmology is that all particles have to eventually decay. And while a proton decay is possible ( even with other theories ) after more than 1032 years, the decay of fundamental fermions is a lot tougher to come to grips with. https://en.wikipedia.org/wiki/Conformal_cyclic_cosmology
31. 2 points

## Significance of Enantiomer?

Get a ball'n'stick box and remake two compounds with different chirality. It will visualize you the difference. https://www.khanacademy.org/science/organic-chemistry/stereochemistry-topic/chirality-r-s-system/v/chiral-achiral-jay
32. 2 points

## Copenhagen Interpretation?

The many world interpretation is not pecular to QM. It can be seen as an interpretation of probability itself (although I don't like it). If you toss a coin, it can be either head or tail. Suppose you get head. There was an equal probability of getting tail before the start of the experiment. Thus, why one event is partially favoured when tossed randomly ? This might raise the thought that there exists another world( read universe), where you tossed the coin and got a tail. Since QM is all about probabilistic nature of the world, people interpret it using this argument. Such theories naturally go to multi-verse concepts and scifi. . . But I don't consider this uncertainty in QM to be a source of theorising multiverse. Rather it is a fundamental property of the Fourier transform! Take an example of a signal. If you squeeze its time period, it's frequency curve is flattened. The Fourier transform has a remarkable property. If you try to squeeze or localise a signal( or a wve or any function) in one domain, it will not be localised in its conjugate domain (not a good terminiology, but I am using it to illustrate the property). Conjugate domains or variables simply mean two domains or variables whose functions form a Fourier transform pair. For example, take time and frequency. The uncertainty in QM comes from the fact that position x and its associated conjugate variable wavenumber k form a Fourier pair. By de Brogile's hypothesis, you have p=hk/2pi, or the momentum is directly proportional to k. This thus clearly forms another pair of conjugate variables, with just another constant in the exponentials. Indeed I actually kind of believe that the entire mysteries of QM can be dragged down to this fact that p and x are conjugate pairs. If you want maths, just google about it and there's plenty of lecture notes. If you are a beginner, I would suggest get a good textbook or try an online course. Hope I cleared your doubts .
33. 2 points

## Wall of Fire

While this "Wall of Fire: has a high temp, you have to understand the difference between temperature and heat content. Temperature is a measure of the average kinetic energy of the particles. Heat content is the total of the KE of the particles in a given volume. Thus a volume that contains a lot of low temp particles can have a larger heat content than an equal volume with higher temp, but fewer particles. Now while articles have described this wall as being of a "high density", this is meant relative to the normal solar wind density of a few particles per cubic centimeter. This a much better vacuum that can be achieved by man on Earth by several magnitudes. This "thick wall" off plasma is a not that much less of a vacuum. To melt a comet you need to add a fair amount of heat energy to it, and even at such a high temperature, this plasma has nowhere near the total heat content per cubic meter to do this.
34. 2 points

## What are you listening to right now?

htt ps://youtu.be/8NmoMe2_53I
35. 2 points

## Which is the most suitable technique? (Genetics)

That could work, if you use the right primers, of course. There are multiple ways to approach this issue all with different advantages and disadvantages. It also depends a bit on the subject. But given the details you have provided I would not see why a PCR would not work. Edit: It would not work if you for some reasons a mixed sample, for instance.
36. 2 points

## The Uncertainty Principle

The connection comes from the Robertson version of the uncertainty relations. The one you can find on Wikipedia is the Robertson-Schrödinger version. I will give you a proof of the Robertson version which does not involve the anti-commutator. Say you have any two operators $$A$$ and $$B$$, which in general do not commute. Say your system is in a pure quantum state $$\left|\psi\right\rangle$$. The mean square deviation is defined as, $\left(\triangle_{\left|\psi\right\rangle }A\right)^{2}=\left\langle A^{2}\right\rangle _{\left|\psi\right\rangle }-\left\langle A\right\rangle _{\left|\psi\right\rangle }^{2}=\left\langle \psi\left|A^{2}\right|\psi\right\rangle -\left\langle \psi\left|A\right|\psi\right\rangle ^{2}$ and similarly for $$B$$. Now define operators $$A'$$ and $$B'$$ centred on their respective average values: $A'=A-\left\langle A\right\rangle _{\left|\psi\right\rangle }$ $B'=B-\left\langle B\right\rangle _{\left|\psi\right\rangle }$ It's easy to see that, $\left[A',B'\right]=\left[A,B\right]$ Now you formally build the 1-parameter family of operators: $C=A'+i\lambda B'$ This operator is not Hermitian, but it is always true that, $\left\Vert C\left|\psi\right\rangle \right\Vert ^{2}=\left\langle \psi\left|C^{\dagger}C\right|\psi\right\rangle \geq0$ This gives you a polynomial condition in $$\lambda$$: $\left(\triangle_{\left|\psi\right\rangle }A\right)^{2}+\left(\triangle_{\left|\psi\right\rangle }B\right)^{2}\lambda^{2}+i\lambda\left\langle \left[A,B\right]\right\rangle _{\left|\psi\right\rangle }\geq0$ If this polynomial must always be above the real axis, the discriminant must be negative or zero: $\left(\left\langle i\left[A,B\right]\right\rangle _{\left|\psi\right\rangle }\right)^{2}-4\left(\triangle_{\left|\psi\right\rangle }A\right)^{2}\left(\triangle_{\left|\psi\right\rangle }B\right)^{2}\leq0$ Keep in mind that if $$A$$ and $$B$$ are Hermitian, so is $$i\left[A,B\right]$$. This immediately gives you the Robertson version of the uncertainty relations for arbitrary operators $$A$$ and $$B$$: $\triangle_{\left|\psi\right\rangle }A\triangle_{\left|\psi\right\rangle }B\geq\left|\left\langle \frac{i}{2}\left[A,B\right]\right\rangle _{\left|\psi\right\rangle }\right|$ So when two operators do not commute, you cannot define "dispersions" or "precisions" (mean square deviations) better than those given by the above. I hope that helped. It's the simplest demonstration I know of the more general Robertson version for arbitrary operators.
37. 2 points

## Should we reply to the WOW! Signal?

The closest, Hipparcos 43587, is about 41 light years away, so we still have a number of years before the aliens come and eat us.
38. 2 points

39. 2 points

40. 2 points

## In between 3000 BC 1400 AD

But since the OP specifically used "BC" and "AD", which are not used in the Hindu calendar, that is not relevant here.
41. 2 points

## Wow it looks like God really does exist

Maybe it's just the timing, but I don't remember being this disgusted by a religious assertion before. It shows a myopic and desperate need for privilege that ignores reality. This is the stance that can justify wiping out species wholesale, because they were only put there "for us to enjoy". It's also intellectually dishonest to misuse scientific claims to bolster your shaky belief system. Please stick to your Iron Age sky spirit worship.
42. 2 points

## How Trump Could Steal The Election

Reporting suggests it was just another publicity stunt to help launch his own television network farther to the right than Fox News. He never expected to win or even go ice farther than the primary. We all apparently underestimated the stupidity and gullibility of the American voters.
43. 2 points

## Subjective flow of time

That's a great answer. I remember when I was a kid my summer holidays felt like an alternative life. Full of experiences that seemed like brought from another world.
44. 2 points

## Does Classical Gravity exist in the "atom."

So many misconceptions. So many wrong assertions. Remember what I said about looking stuff up, before putting your ignorance on display ? Ask one question at a time, and don't go jumping to conclusions. The only gravity there is, is classical, whether Newtonian or GR. Yes, atomic particles interact gravitationally. For an atomic particle, the Electromagnetic interaction is approx. a billion, billion, billion, billion times stronger than the Gravitational interaction. The Strong interaction, mediated by gluons and binding quarks below its asymptotic limit, is 137 times stronger than the Electromagnetic interaction, but only 'residual' force binds nucleons inside the nucleus, and quickly drops off after that. So why would you conflate the two, and go on to make all the other ignorant assertions ???
45. 2 points

Has it ever occurred to you that the inherent paradoxes involved in time travel, such as any causality breaking or 'grandfather' paradox, suggest time travel is unreal ???
46. 2 points

## How Trump Could Steal The Election

Trump would have been a shoo-in if he had simply acted like a normal human being: Don't criticize gold star families. Don't criticize dead men (e.g. McCain). Don't call Hispanics 'rapists'. Don't be a misogynist in public. Don't be a racist in public. Don't steal children and put them in cages. Or the one that would have been enough all by itself: admit that a virus can make people sick and act accordingly. I"m sure there are many I didn't mention, but my point is that Trump has been shooting himself in the foot for years and if he would have paused just a bit he may have been able to start celebrating his next term late last night. I can't really convey how disappointed and embarrassed I am that so many of my fellow citizens accept, and even celebrate, his behavior.
47. 2 points

## Layered Mesh Optical Illusion

When a grid's misaligned with another behind, that's a Moiré https://xkcd.com/1814/
48. 2 points

## What are you listening to right now?

OK Moon. Election songs.
49. 2 points

## rare argument against free will

This is one of the weirdest definitions of free will I've ever heard. Without external factors there is not even a reason to act. What you want is always in a field of possibilities from which you can choose. Using a more direct, less controversial definition of free will your problem does not even arise.If you can act according your own wishes and beliefs, then you acted freely. If you can act freely, you have free will. Or let it put a little differently: given your wishes and beliefs, if you can act according to them, you have free will. The idea that you can choose what preferences you have (before you are born???) is an absurd idea. 'You' were not there, so who is doing the choosing of your preferences? And what are the preferences used to choose your preferences? Using a definition that implies an infinite regress from the beginning is a very poor move, and leads inherently to absurdities. You do not choose who or what you self are. But you can choose how to act. That is the touchstone for the question if you act freely: if you act according your own (given!) preferences, you act freely. If you are coerced, i.e. act according the preferences of somebody else, against your own preferences is a 'none-free' action.
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