conversations sequence | source stringclasses 6
values |
|---|---|
[
"Can brain cells move? By movement I mean long distance migration (preferably within the brain only).",
"The question is relatively broad and one should take into account that the brain not only consists of neurons, but also glial cells (supportive cells) and pre-mitotic neuronal stem cells. Furthermore, as criti... | stackexchange |
[
"In our computer systems lecture we were introduced to the MIPS processor. It was (re)developed over the course of the term and has in fact been quite easy to understand. It uses a RISC design, that is its elementary commands are regularly encoded and there are only few of them in order to keep the wires simple.\nI... | stackexchange |
[
"View tabular file such as CSV from command line, having horizontal and vertical scrolling would be great.",
"Sure, please take a look at csvkit. It provides a set of tools that adhere to the UNIX philosophy (meaning they are small, simple, single-purposed and can be combined). \n\nHere is an example that extract... | stackexchange |
[
"Slater type orbitals (STO) are considered to be more accurate than gaussian type orbitals (GTO) for atomic and molecular QM calculations because - among other reasons - they decay with $e^{-\\alpha r}$ as $r \\to \\infty$. But GTOs are more popular because they are easier to calculate with. GTOs decay with $e^{-\\... | stackexchange |
[
"Tor can only handle TCP connections, but DNS is a UDP protocol. How does Tor route DNS requests over its TCP based network? Why can the same approach not be used to route all UDP traffic over Tor?",
"Tor clients do not, in general, directly do DNS requests. When you open a connection through the tor network you... | stackexchange |
[
"How do DOS games like DOOM benefit from a PCI graphics card?",
"DOOM itself doesn’t do anything special to benefit from PCI graphics cards. It runs faster with PCI graphics cards (and VLB, AGP, and PCI Express cards) than with ISA graphics cards because the supporting bus is faster, so reads from and writes to v... | stackexchange |
[
"Why does PRC devalue its currency on purpose, but Turkey is worried about the devaluation of its currency?",
"Trade surplus/deficit\nDevaluing one's currency means mostly one thing: It becomes more expensive to import products from abroad, while one's own products become comparably cheaper to buy on the world ma... | stackexchange |
[
"Is it worth patenting an algorithm if I don't have the money to defend against infringements?",
"This is a great question, with no one right answer.\nThe strength of a patent comes from the ability to enforce it. If the patent owner cannot enforce it for whatever reason (such as a lack of funding), the patent is... | stackexchange |
[
"If we should encrypt the message rather than the method of transfer, why do we care about wifi security? Is this just security theatre?",
"Network encryption protects against different set of threats than application layer encryption like TLS.\nIn particular, network encryption like Wifi encryption are primarily... | stackexchange |
[
"What do different people in the department expect from a postdoc?\nBy different people I mean the advisor, graduate students and PhD students.\nI know it mainly depends on the job description but there are few basic things that a postdoc must be expected to do. How aggressive (proactive) must one be? This question... | stackexchange |
[
"How to connect mysql workbench to running mysql inside docker?",
"By default after deployment MySQL has following connection restrictions:\n```mysql> select host, user from mysql.user;\n+-----------+---------------+\n| host | user |\n+-----------+---------------+\n| localhost | healthchecker |\n| l... | stackexchange |
[
"Can meat spoil outside the fridge if it's baked into bread as a filling?",
"There are two differences between your buns and a tin can.\nFirst, your buns were heated to a core temperature of under 100°C. Yes, your oven was probably set way higher, but the water content in your filling prevents it from getting hot... | stackexchange |
[
"Say, a table ```car``` has one-to-one relationship to tables ```electric_car```, ```gas_car```, and ```hybrid_car```. If a ```car``` is ```electric_car```, it can no longer appear in ```gas_car``` or a ```hybrid_car```, etc. \nIs it a bad practice to have several mutually exclusive one-to-one relationships in data... | stackexchange |
[
"I see a low use of Mathematica in Kaggle competitions. Why would one use the Wolfram Language versus R, Python, or Julia for machine learning? Besides prettier plots and the Manipulate function, do we have something that is useful for ML that other languages are lacking?",
"Mathematica doesn't have the depth of ... | stackexchange |
[
"I've noticed that people on YouTube and even on TV would sometimes say things like \"I used to take lots of coke a few years ago\" or \"I used to smoke weed daily until this and that\" or \"Yea, I smoke weed every once in a while,\" or \"I used to pirate games a lot when I was a bit younger\" or \"I used pirated W... | stackexchange |
[
"I am a Tor developer. I understand that the .onion address is a public key of sorts, but not much more than that (I can vaguely guess, though). When nobody knows the IP of the .onion address, how do requests reach it? Are they bounced between nodes in the P2P network till someone decrypts it with the corresponding... | stackexchange |
[
"I have been offered a PhD position by an inexperienced professor in a great institution in Europe. Despite the fact that the institution is very strong in my area, since the position was offered by this particular professor, I would have to commit myself to working with him for my thesis. This professor is young, ... | stackexchange |
[
"Is there a phrase that means \"too important\" and \"attracting too much attention\"?",
"There is the term \"overdominant\":\n\nFrom Collins dictionary:\n\n>overdominant [adjective]\n excessively dominant\n To begin with, the design aspect is the most striking and arguably remains overdominant. [Times, Sunday Ti... | stackexchange |
[
"This guy claims that Olympic powerlifters working in the 1-6 rep range can increase strength without increasing muscle size. \n\n> Trained Olympic lifters, for example, were shown over a two-year period to have significant strength increases with barely noticeable increases in muscle mass (Hakkinen et al, 1988). I... | stackexchange |
[
"What are the major concerns about planting trees to create carbon offsets?",
"Here are some common concerns about using tree planting projects to create carbon offsets:\n\n* The scheme actually has a net positive effect, both in the short and long-term/\nHow effective a tree planting scheme is in capturing and s... | stackexchange |
[
"In Shutter Island, at the end of the movie Teddy had a chat with Chuck, in that scene Teddy told to Chuck as,\n\n Which would be worse: To live as a monster, or to die as a good man?\n\nWhat's the implicit meaning of this dialogue? Who's the monster as Teddy mentioned?\nAnd, who's a good man?",
"To Live as a Mo... | stackexchange |
[
"I have been puzzling over where to put the submit button, on the left or the right. In researching, I noticed that many sites put buttons on the bottom right in dialogue boxes, and on the bottom left in forms.\nIt makes sense: in a dialogue box it seems to denote finality, being in the endpoint of the window for l... | stackexchange |
[
"What is the difference between Non-Player Characters (NPCs) and bots in video games?",
"The key distinction is that a Bot represents an automated player; an NPC, by contrast, isn't playing the game at all.\n\nIn general, an NPC is a part of the game; a placed object which is designed by the creator and exists to... | stackexchange |
[
"This claim was made popular by being said in the movie The Social Network. It exactly says:\n\n> Did you know there are more people with genius IQs living in China than there are people of any kind living in the United States?\n",
"This claim can actually be tested very easily. Others have done it, e.g. Brian Di... | stackexchange |
[
"Different coffee packets advertise different amounts of 'Robusta' and 'Arabica'? What do these terms refer to, and how does it affect the taste of the coffee?",
"\n\n* One reason that the taste isn't as good for Robusta is that it has more caffeine compared to Arabica. Which may sound like a positive thing but c... | stackexchange |
[
"So whenever we want to shoot our flash before taking a photo. we have to charge it first.\nWhat is the point of the charging our flashes? Aren't their power directly supplied by the battery of our camera?\nPlease answer for the built in flash on the 2000D and the traditional hot shoe Xenon flashes.\nPerhaps these ... | stackexchange |
[
"What are some strategies to maintain morale and productivity after massive layoffs? I am not in a managerial role, just a lead role, and am asking for myself and my fellow employees.",
"The situation you're describing is tough. Layoffs have a very real impact on both the individuals that are let go and those tha... | stackexchange |
[
"Could you please clearly explain what is the difference between correlation and convolution that is done by a filter on an image? \nI mean in terms of signal processing definition I know that convolution describes the output of an LTI system, that is if an LTI system produces an output due to convolution with an i... | stackexchange |
[
"How can horns, most of which have only three buttons, play all their notes?",
"Put as simply as possible, horns are tubes. Blowing in special ways makes certain notes sound from those tubes. By changing one's embouchure, those notes start at a fundamental, then gradually go up in harmonics. The first notes (in k... | stackexchange |
[
"My university usually asks that we book a flight via a travel agent, but the prices he gives me are about $50 higher than the prices I can get by online booking in the flight company's website. Why would a company want me to book a flight via a travel agent if it is more expensive?",
"There are several reasons ... | stackexchange |
[
"Layman's explanation of encryption backdoors",
"There are two somewhat orthogonal concepts in backdooring encryption algorithms:\n\n* The backdoor can be explicit or implicit. An explicit backdoor is one that everybody knows it is there. An implicit backdoor strives at remaining undetected by the algorithm owner... | stackexchange |
[
"Suppose I have the geographic coordinates of "Saratoga, California, USA" as\n```Latitude: 37°15.8298′ N\nLongitude: 122° 1.3806′ W\n```\nI know from here that in the case of latitude ```1° ≈ 69 miles``` and that longitude varies:\n```1° longitude = cosine (latitude) * length of degree (miles) at Equato... | stackexchange |
[
"I noticed that there is a binary executable ```/bin/echo``` on my Ubuntu MATE 17.04 system.\nI thought, that's odd, because\n```$ type echo\necho is a shell builtin```\nCursory testing suggests that ```/bin/echo``` does the same sort of thing as the Bash builtin ```echo```:\n```$ /bin/echo foo\nfoo\n$ /bin/echo $U... | stackexchange |
[
"In most introductory algorithm classes, notations like $O$ (Big O) and $\\Theta$ are introduced, and a student would typically learn to use one of these to find the time complexity.\nHowever, there are other notations, such as $o$, $\\Omega$ and $\\omega$. Are there any specific scenarios where one notation would ... | stackexchange |
[
"Why is Gaia operating around Earth orbit? Why not send it to Neptune's orbit?",
"Well, you thought about the spatial aspect of a parallax measurement, but not about the temporal one.\nGaia's intention is to measure 3D positions as well as 3D velocities. For the distance, you need accurate parallactic measurement... | stackexchange |
[
"I am used to thinking of finite-differences as a special case of finite-elements, on a very constrained grid. What are criteria to choose between finite-differences and finite-elements",
"It is possible to write most specific finite difference methods as Petrov-Galerkin finite element methods with some choice of... | stackexchange |
[
"How important is multithreading in the current software industry?",
"It is extremely important.\nWhat is more important though is to understand that multithreading is just one way to solve the asynchrony problem. The technical environment in which many people are now writing software differs from the historical ... | stackexchange |
[
"Normal filesystem images can be easily mounted:\n```mount system.img /mnt\n```\nExamined, and modified. But when I try this with a Raspberry Pi system image (e.g. raspbian), I get:\n```mount: unknown filesystem type '(null)'\n```\nAnd no matter what I try with ```-t```, it won't work. How can I mount this image?... | stackexchange |
[
"How does immersion passively help with learning a language?",
"There are a few reasons why immersion helps you learn a language without you actively trying:\n* You encounter the language more often. When you are immersed in a language, you don't go to class and do homework for a few hours a week, but rather use... | stackexchange |
[
"Adding a new swap file. How to edit fstab to enable swap after reboot?",
"These ares the steps to create a swap on a file:\n\n1. Create a large file e.g. with\n```sudo mkdir -p /var/cache/swap/ # create a directory that holds the swap file\nsudo dd if=/dev/zero of=/var/cache/swap/myswap bs=1M count=4096 # for ... | stackexchange |
[
"Since long time ago I have been thinking in two problems that I have not been able to solve. It seems that one of them was recently solved. I have been thinking a lot about the motivation and its consequences. Mostly because people used to motivate one of them with some very interesting implications. My conclusion... | stackexchange |
[
"How do GPS receivers communicate with satellites?",
"The first thing to know is the communication is one-way. There's a satellite-to-receiver transmission, nothing going in the opposite direction. So your cell phone doesn't have to find the radio power to send a signal all the way to space!\n(exceptions: The dec... | stackexchange |
[
"Why is iceberg lettuce bad for rabbits?",
"In short, iceberg lettuce is mostly water with little to no nutrient value. A rabbit can fill up on it (because of the bulk), but still need food because they didn't get enough calories, vitamins, minerals, etc.\nIf you look at the USDA's webpage on iceberg lettuce. You... | stackexchange |
[
"How do I open the JavaScript console in different browsers?",
"Chrome\nOpening the “Console” panel of Chrome’s DevTools:\n\n* Windows and Linux: Ctrl + Shift + J\n* Mac OS: Cmd + Opt + J\n\nNote: In addition to the “Console” panel, there also exists a smaller slide-up console which can be toggled via Esc while a... | stackexchange |
[
"I have Ubuntu 10 as the guest OS on a Windows 7 machine. I have been trying to setup shares through VirtualBox, but nothing is working. First, I create the share in VirtualBox and point it to a Windows folder. Then I try to mount the drive in Linux, but I keep getting\n```/sbin/mount.vboxsf: mounting failed wit... | stackexchange |
[
"What does %~dp0 mean, and how does it work?\nI'd also like to know if it is a documented feature, or something prone to be deprecated.",
"Calling `for /?` in the command-line gives help about this syntax (which can be used outside FOR, too, this is just the place where help can be found).\n\n> In addition, subst... | stackexchange |
[
"Should a tester feel bad about finding too many defects/bugs in the product?",
"If this is a medical application you are talking about it is serious stuff. What if the bugs affected real users? Developers would be much less happy if they put in life threat someone or if management has to retire a product or make... | stackexchange |
[
"Millions of colors in the visible spectrum can be generated by mixing red, green and blue - the RGB color system. Is there a basic set of smells that, when mixed, can yield all, or nearly all detectable smells ?",
"There are about 100 (Purves, 2001) to 400 (Zozulya et al., 2001) functional olfactory receptors in... | stackexchange |
[
"Especially in blitz or bullet games, it is possible that a player makes an illegal move, for example castles through check. \n\n* If the opponent does notice the illegal move, then as far as I know the first player is obliged to make a legal move with the same piece, if one exists. What if there are no legal moves... | stackexchange |
[
"The following article from CNN describes a Michigan police officer being put on administrative leave for having KKK material at his home: https://www.cnn.com/2019/08/10/us/michigan-officer-placed-on-leave-kkk-document-house/index.html. The materials were discovered while a potential buyer was touring his house. \n... | stackexchange |
[
"What does strength refer to in mathematics? Is it a formal idea?",
"Suppose you have a theorem that says \"If $X$, then $Y$.\" There are two ways to strengthen such a theorem:\n\n* Assume less. If you can reduce the number of hypotheses, but still prove the same conclusion, then you have proved a more \"powerf... | stackexchange |
[
"Does vegetarianism affect life expectancy?\nIs an average vegetarian supposed to live longer just because of their diet?",
"Yes, according to a paper by the American Society for Clinical Nutrition.\n\n> Results: Our review of the 6 studies found the following trends: 1) a very low meat intake was associated with... | stackexchange |
[
"I've come across the polynomial algorithm that solves 2SAT. I've found it boggling that 2SAT is in P where all (or many others) of the SAT instances are NP-Complete. What makes this problem different? What makes it so easy (NL-Complete - even easier than P)?",
"Here is a further intuitive and unpretentious expla... | stackexchange |
[
"My mom has a green card that expires 2028 but has been out of the US in the UK for over a year due to COVID travel restrictions. Can she enter now?",
"Assuming she doesn't have a valid Re-entry Permit, she technically doesn't have one of the accepted documents for entry of a returning immigrant, as listed in 8 C... | stackexchange |
[
"What is the LXX and why is it so noteworthy that there is a Greek translation of the OT? Wouldn't it be better to directly reference manuscripts in the original languages?",
"Before 1947, a good case could be made that the Septuagint represented a more ancient tradition than the Masoretic versions of the Tanakh.... | stackexchange |
[
"I'm no expert in darkroom photography, but it seems a little odd that there is a type of light that doesn't affect film or developing paper etc. So why is a dark-room safelight safe?",
"Photo films and papers are made from salts of silver that naturally only darken when exposed to violet or blue light. In the ea... | stackexchange |
[
"What did the Soviet Union and Russia bring to the ISS?",
"Initially, everything. The ISS started out as Mir-2 with some extra modules added soon afterwards. Then lots more over the next 10 years.\nThe initial modules, Zarya and Zvezda, which housed living quarters, reboost, attitude control, solar power, life su... | stackexchange |
[
"What utility can move my Windows boot partition over to another hard drive?\nMy preference is that it would be really easy. \n\n* Boot into Windows\n* Pick drive to move\n* Pick target drive\n* It copies everything over, and reboots to the correct partition.",
"## DriveImage XML\nDriveImage XML will do the job. ... | stackexchange |
[
"What's the difference between ASCII and Unicode?",
"ASCII has 128 code points, 0 through 127. It can fit in a single 8-bit byte, the values 128 through 255 tended to be used for other characters. With incompatible choices, causing the code page disaster. Text encoded in one code page cannot be read correctly b... | stackexchange |
[
"Given that Kohn-Sham DFT is strictly a ground-state method (at 0 K), how is it sufficient to describe materials in real-life applications?",
"These are a few extra points to complement Andrew Rosen's comprehensive response:\n\n* To be absolutely clear, typical DFT calculations are not performed at 0K, a better d... | stackexchange |
[
"I don't really get the difference between gain and volume boost.\n\nSo if I understand correctly, gain directly boosts a signal from a line or input while volume handles the output. Volume isn't really for boosting either.\nWould this mean, in most settings, getting 'close to' as much gain as possible without any ... | stackexchange |
[
"Why isn't the market dropping like a stone with all the bad news?",
"Market reactions to information are not always timely, proportional, or rational. \nWe don't know the full impact of our current situation; we're feeling it out.\n\n* Some people (bulls), believe that the initial dip was an over-reaction, that ... | stackexchange |
[
"In Raiders of the Lost Ark, at the Ark opening ceremony the Nazi troops brings the Ark of the Covenant to the top of the mountain as Belloq said something before opening the Ark. Then they took the sand from the Ark and suddenly spirits coming out from the Ark and they're all killed (except Indy and Marion) by the... | stackexchange |
[
"What is likely to happen when you plug two ends of a network cable to a single switch/router? Will this create problems on the network, or just be ignored?",
"It depends on the router/switch. \nIf it's \"Managed\" - Like decent Netgear, Cisco or HP Procurve, or has STP (Spanning Tree Protocol) or one of its vari... | stackexchange |
[
"Why don't toilets use saltwater?",
"The main answer is logistical. Building a network of pipes to convey water to houses is a major effort, and most places where that's been done found it extremely expensive. Providing a second set of pipes to bring salt water to houses would probably cost about the same. Except... | stackexchange |
[
"In 1969, NASA not only went to the moon, but broadcast the whole thing live on TV.\nHow did they achieve the TV broadcast? What technology did they need to use to send a video and audio signal from the moon to earth? Was there much of a lag?",
"Apollo 11 mission had two modules\n\n* Lunar module - which descent ... | stackexchange |
[
"A lot of ShaderToy demos share the Ray Marching algorithm to render the scene, but they are often written with a very compact style and i can't find any straightforward examples or explanation.\nSo what is Ray Marching? Some comments suggests that it is a variation of Sphere Tracing. What are the computational adv... | stackexchange |
[
"Make a single page landscape in Google Documents",
"Currently a single Google Document can only be either Landscape or Portrait not both. Changing page orientation is done by selecting File and then Page setup.\n\nIt is currently recommended to separate the Landscape and Portrait pages into different documents. ... | stackexchange |
[
"I have heard many people saying, “Hah! I beat Stockfish,” and one saying, “I am the best chess player ever! I beat Stockfish.” So I wonder if it is possible, just to know whether I should try to beat it. I tried to play it once; I barely played 25 moves.",
"The answer is that they either played it on some very h... | stackexchange |
[
"Other than rust, corrosion, and other reactions with air that would make the use of a metal unfavorable, how do different metals affect the performance?\nLet's give Yagi an example:\nLet's say I use 4 different metals for the directors\n, reflector, and driven element.\nOne antenna made out of copper, one made out... | stackexchange |
[
"Windows in its earliest days was simply a shell that ran on top of MS-DOS, which means that Windows 3.1 itself was actually just a standard MS-DOS application like any other.\nYet, MS-DOS is not a multitasking operating system, and at the same time, Windows applications were compiled native-code binaries that ran ... | stackexchange |
[
"In Civilization V, you attain a cultural victory by accumulating enough culture to purchase at least 36 social policies, and then building a wonder. The catch is that the more cities you build, the more culture you need to generate before you hit the next \"plateau\" of culture.\nWhat is the ideal number of cities... | stackexchange |
[
"I have a 9 year old daughter that has expressed some interest in manga, but I'm having trouble locating series that are appropriate for her age. No one at our local bookstore could offer any advice. Is there a kid-friendly imprint or other resource I could use to help her find something appropriate? My preference ... | stackexchange |
[
"In Dupire's local volatility model, the volatility is is a deterministic function of the underlying price and time, chosen to match observed European option prices.\nTo be more specific, given a smooth surface $(K,T)\\mapsto C(K,T)$ where K is the strike and T is time to maturity. Dupire equation implies that ther... | stackexchange |
[
"Can you explain why we need a large number of trees in random forest when the number of predictors is large? How can we determine the optimal number of trees?",
"Random forest uses bagging (picking a sample of observations rather than all of them) and random subspace method (picking a sample of features rather ... | stackexchange |
[
"I believe artificial intelligence (AI) term is overused nowadays. For example, people see that something is self-moving and they call it AI, even if it's on autopilot (like cars or planes) or there is some simple algorithm behind it.\nWhat are the minimum general requirements so that we can say something is AI?",
... | stackexchange |
[
"Let's say that we have a gaseous or liquidus compound (I don't know if elements or compounds make a difference, take this as a thought experiment), and we have a tungsten or steel block that's 5cm (or less, you choose) thick. Is there any physical method for that gas or liquid to pass through that thick heavy meta... | stackexchange |
[
"Once, I boarded a plane, went to my designated seat and tried to put my bag in the overhead bin. However, it was full, and other adjacent overhead bins were full too. Because I had a seat next to the emergency exit, which I paid for, I had to hand over my bag to someone else in order to take off. \nDo I have any r... | stackexchange |
[
"The Canon EF 40mm f/2.8 has a designation of STM on the lens. What does this mean? What are the advantages of having it and does it replace an older technology?\n",
"STM stands for Stepper Motor and is a applied to a new range of Canon lenses which feature a new design of focus motors which, along with a new iri... | stackexchange |
[
"You start with the number 1536. Your mission is to get to 1 in as few steps as possible. At each step, you may either multiply or divide the number you have, by either 2 or 3; but, only if the result is a whole number whose first digit is 1, 3, 4, or 9. That is all.",
"As Jo has already shown, this can be accomp... | stackexchange |
[
"When an expendable booster rocket stage nears the end of its burn, does the guidance computer shut the engine(s) off at a certain velocity/altitude for the mission, or does the stage completely exhaust its propellants?",
"First stages are generally run to depletion (though not complete depletion). First stage as... | stackexchange |
[
"I'm working at my first programming job. My boss is a very smart software engineer, and I feel\nlike I have very little to offer compared to him. Problem is, he is always busy, and needs someone to help him out. I feel like I'm not good enough, but I still want to succeed. I want to be a great programmer.\nWhat ca... | stackexchange |
[
"I have noticed that some games quote the requirement for \"pixel shader 3.0 or better\". \nWhat is a pixel shader and is it some software requirements or hardware requirements?",
"Simple answer\nPixel shaders are tiny programs that can do operations on a single pixel on the screen, as opposed to geometry shaders... | stackexchange |
[
"Red light facing forwards? It was nighttime in Manhattan. Isn't more always better when it comes to being seen?",
"No. You should always ride with a white light facing forward and a red light facing backwards. If you want additional illumination, you can add multiple white/red lights in the appropriate direction... | stackexchange |
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