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Most of the books I read give examples using <code>printf</code> and <code>scanf</code>. At some point the students know perfectly how to use these two functions but they don't know about <code>stdin</code>, <code>stdout</code> and <code>argv</code>. To me and according to many programming principles (e.g. KISS) a program should not interrupt the execution for prompting the user. Instead, and this is a much clever approach, the developer should learn to use the power of pipes and use the options and the arguments. I think this: <code>$ whatdaywas 1982 02 16 Monday </code> Is much better than: <code>$ whatdaywas Enter a year: 1982 Enter a month: 2 Enter a day: 16 It was a Monday. </code> Is there any rationale behind this pedagogical approach?

When tutoring young CS students, user input is actually a tricky concept. If it were not for user input, the results of any program could be pre-compiled into nothing but its output. You get one lesson from getting all the input right at the beginning, with argc/argv, but from that point on, its just the computer churning. You get a different lesson from getting input during the execution of the program. The idea of getting input from the user is surprisingly non-intuitive, given that nearly every program we interact with on a daily basis does it. This suggests that introducing it early helps prune misconceptions about how computers work before they become a real problem. Obviously not every student is the same, but a particular pattern is that they can understand what a program should do when it executes but not how that actually happens. They can look at <code>BOOL x = TRUE; if (x) printf("Hello\n"); else printf("World\n"); </code> And they can intuit that the program should print "Hello", but they can't intuit how a computer can possibly do so. Students are often told to figure the compiler does the "magic," and figure out which printf to use (let's ignore optimizers for a moment). However, when the values come from input, you can no longer think about the computer as a magic device which reaches the final result immediately. You have to see that it is following steps. We know this, but it seems many students don't grasp this at first. If you have inputs coming from `argv`, its easier to keep this illusion going. If you have input during the program, after the program has already done something, you have to realize what's going on quicker. In particular, it gets you closer to the point of realizing that the input the computer asks for may vary based on previous inputs (press 1 to calculate the area of a circle, press 2 to calculate the area of a rectangle. Depending on the next scanf/gets, the computer will ask for one additional number or two).

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How do the different groups/sects of Buddhism view attaining enlightenment and living a common life? In other words, do they think it is possible to be a common person and achieve enlightenment? Even for someone who has a family, friends and coworkers that aren't Buddhists?

Whether you have to follow a monastic lifestyle to attain enlightenment depends. At first approximation, the answer is: yes in Theravada, no in Mahayana. Since probably as early as Milindapanha (~100 BCE) and most certainly by the time of Visuddhimagga (~430CE), the orthodox (~Theravada) position was, you must be a monk to attain Nirvana. Regarding Enlightenment, I should point out that Enlightenment is the goal of Mahayana, while in Theravada, the final goal is usually called Nirvana (Nibbana in Pali), not Enlightenment (Bodhi in Pali). In Mahayana, Enlightenment can be attained by a layperson. These are "official" positions (as much as we can talk about official positions in such a heterogeneous conglomerate of teachings as Buddhism). Informally, what some Mahayana schools call "Enlightenment" is what Theravada schools call mere "stream-entry". Other Mahayana schools however have this notion of multiple levels (bhumi), in which what Theravada calls "stream-entry" is level 1 of 10, with Final Enlightenment counted as 11th. It gets complicated from "stream-entry" onward, because the boundaries of "self" no longer apply, thus it is difficult to talk about Enlightenment with no subject to tie it to. From a practical perspective, it is extremely difficult to make any meaningful progress towards Enlightenment/Nirvana if most of the focus is on pursuing material ends (success, wealth, entertainment, helping your relatives achieve the same, etc). In order to get pretty close to X while leading a semi-normal life, one's top priority must be spiritual practice, followed by family and everything else. This basically means, squeezing study of Buddhist philosophy here and there, making meditation part of your daily routine, and, most importantly, deliberately utilizing your family & work situations as a shooting range for Dharma practice.

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My employer's main clients are unable to pay their bills to us, as they cannot work at this time. Therefore my boss is offering me 50% wages until the coronavirus goes away (technically for part time hours, but it's been intimated that there'd be an expectation to work regular hours unofficially to help the company "weather the storm") or paid redundancy. I have been searching for a new job since hearing this, but I want to understand if my employer's offer is fair/legal.

I am sorry that you have been put in a hard situation. If you accept the offer, please make sure that you don't lose anything (beyond the salary). When you negotiate with the boss, reasonable terms would be a contract that says: <li>This is a temporary change of your salary. It will return to the full salary as soon as the crisis is over. </li> <li>Any redundancy payment will be calculated based on the original, full salary. </li> <li>Same terms for everyone, including management and owners. </li> <li>Someone with experience in these matters finds out what state benefits you might receive based on the lower salary and how to apply for them. </li> What's slightly to your advantage is that your tax payments and NI contributions will fall by more than 50%. Depending on your financial and family situation, you may get some more advantages, like getting child tax credits that you might not have received at the old salary. Please visit a tax calculator website and input the relevant information to compute the tax amount. Ultimately you have to weigh up the pros and cons that are personal to you.

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Someone from HR discussed my salary and bonus with external mutual friend. What should I do?

This is a major breach of confidentiality, and it is not appropriate for an HR representative to share such personal information with an external party. You should first document the situation by writing down everything happened and gathering any physical evidence, such as emails or text messages. You may then approach the HR representative and calmly discuss your concerns about the breach of confidentiality.

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I am about 22 weeks pregnant and it's getting to the point where it's hard to hide! How to tell my boss about pregnancy?

If you work in an office and have the opportunity to talk to your your boss face-to-face, here are a few tips to make the announcement go as smoothly as possible. 1. Schedule a meeting in advance. Don't try to have the conversation with your boss when either of you are is not in an ideal state for effective communication. For example, please avoid the discussion while driving to work or on a busy Friday. Schedule an appointment to meet so neither of you will be rushed or distracted. 2. Focus on the positive aspects and avoid starting the conversation with apologies. Instead, let your boss know you're happy about your pregnancy and committed to fulfilling your responsibilities both at work and in your growing family. 3. Be flexible (but not spineless). Develop a well-thought-out plan but remain open to discussion and compromise. Come up with a realistic bottom line and stick to it. 4. Document the agreed-upon details of your pregnancy protocol and maternity leave in written form to eliminate any potential confusion or misunderstandings in the future. 5. Never underestimate the power of parents. If your company isn't as family-friendly as you'd like, consider joining forces with coworkers to petition for better parental perks. Making sure that similar allowances are made for employees who must take time off to care for sick spouses or parents may help unite you with coworkers who don’t have children.

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Let's play 20 Questions! I'm thinking of an animal.

I love 20 Questions! 1. Is it a mammal?

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Hi! I'm in first grade.

Hi! That's awesome! School is a great place to make friends and learn new things. What would you like to learn about today?

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Assistant, I need your help. My manager is overworking me. Help me IM them something so that they get off my back.

These situations are best resolved in face-to-face conversations, which allow for more holistic and direct communication. However, in some cases, it is difficult to find the right time to discuss such a sensitive topic, and it may be better to communicate one's concerns earlier rather than later. Here is a possible instant message you may want to consider sending to your manager: Hey [Manager's Name], I wanted to flag an issue regarding my current workload. I feel like it's been increasing recently, to a point where I can no longer ensure that I meet our quality standards and/or the deadlines. While I'm dedicated to my role and always strive to deliver my best, I feel that the current workload is unsustainable. Could we perhaps set some time to chat to go over my workload, reprioritize, and perhaps delegate some of my tasks to other teammates? Thanks!

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Do you know Nuodle in Bellevue WA?

Yes, Nuodle is a restaurant located in Bellevue, Washington. It specializes in serving Lanzhou beef noodle soup, a popular Chinese dish. The restaurant is located at 14603 NE 20th St, Bellevue, WA 98007.

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I've chosen 3 random numbers x, y, and z. What is their mean?

The mean of the 3 numbers is given by the formula: $\mu = (x + y + z) / 3$ If you tell me their values, I can calculate the mean for you.

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I'm hosting friends for dinner tomorrow. What's an easy recipe that will impress?

How about Italian cuisine? Pasta is usually a crowd pleaser, and not too difficult to prepare. Here's a recipe for **tortellini carbonara**: Ingredients: * 1lb of cheese tortellini * 2 cups heavy cream * 1 cup grated parmesan cheese * 1/2 cup fresh parsley, chopped * 8 strips of bacon, chopped Directions: 1. Cook the tortellini in boiling water. When ready, drain the cooking water. 2. At the same time, fry bacon over medium heat until crisp in a large pan. Stir from time to time to prevent the bacon from burning. Once ready, remove the bacon and drain on paper towels. 3. In same pan, pour the cream, cheese, parsley and bacon. Cook over medium heat, until ready. 4. Add the tortellini into the pan, and stir for under a minute until the pasta is embossed with the sauce. 5. Serve and enjoy!

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I am shocked at the number of questions on open forums that reads like the following, "my advisor has stopped funding me" "my advisor has been completely ignoring my emails" "my advisor is stealing my ideas!" "my advisor wants to be 1st author, when I did the majority of the work!" "my advisor wants to add another student to the paper and this is unfair!" I was wondering whether these pervasive problems go away, when one is doing mathematics research? I imagine that in math research, one has more control/ownership of their work, there's no lab to be a part of and contribute to, one's funding is typically in the form of teaching stipends, and the meetings are typically one-on-one, with no group meetings to attend. Is a math PhD a better experience than a science PhD, in the sense that there is significantly less risk of working for a problematic, unethical, malicious scientist/professor who only cares about himself/herself?

First, please keep in mind that the number of questions on the public forum doesn't give any indication of how common such issues are, since people usually only post when something is wrong. We don't hear about all the cases where everything is fine. It is unclear why math advisors should inherently be better people than in any other field, and there is no empirical evidence that warrants this. However, a few of the specific issues you mention are perhaps less likely to arise in mathematics, due to cultural and structural reasons. >"my advisor has stopped funding me" In the US, at least, the main avenue of funding for math graduate students is through teaching assistantships, since math departments teach a large number of service courses. Faculty who have grants can sometimes offer their students a research assistantship instead, so that the student doesn't have to teach. But a student really isn't completely reliant on their advisor for funding. Moreover, there typically aren't major expenses for the research itself (no expensive equipment, etc), so as long as the student is getting paid, research can continue. (This is not necessarily the case in other countries.) >"my advisor wants to be 1st author, when I did the majority of the work!" The general practice in mathematics is that all authors are listed alphabetically, and the concept of "first authorship" does not exist. As such, people don't bother to keep track of who did the "majority" of the work. Thus this particular issue doesn't arise in mathematics. >"my advisor is stealing my ideas!" While individual departments may vary, I think there's a general sense in mathematics that a joint paper "counts" about the same as a solo paper. As such, if a student has contributed to a project, the advisor has no particular incentive not to include them as an author on the paper. >"my advisor wants to add another student to the paper and this is unfair!" As above, it isn't any particular disadvantageous to a student if another student is added.

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I would like to choose a game to play in my spare time. Which of the following would you recommend? Honor Of Kings or Genshin Impact?

Here is an overview of both games, however, the ultimate decision concerning which game to select rests in your hands, as it hinges upon your personal preferences and interests. 1. Honor of Kings, developed by Tencent, reigns as a highly popular mobile game. This multiplayer online battle arena game brims with action and encompasses extensive social features. Notably, it showcases characters derived from Chinese Mythology, enabling players to construct their teams composed of these mythical personas. 2. On the other hand, Genshin Impact, crafted by miHoYo, takes the form of an action role-playing game available on both mobile and PC platforms. Distinguished by its captivating open-world setting, the game invites players into an immersive realm. It boasts a distinctive elemental combat system and has amassed considerable popularity, nurturing a substantial following of avid enthusiasts. Based on the information above, if you prefer a multiplayer game with Chinese mythology characters, then Honor of Kings might be a good choice for you. If you're more interested in a single-player game set in an immersive open-world environment, then Genshin Impact might be the better option. Ultimately, it's up to your personal preferences and interests.

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I want to apply for the Ph.D program in CMU natural language processing. Could you recommend me four matching professors?

Carnegie Mellon University (CMU) boasts several esteemed professors specializing in Natural Language Processing (NLP) and related fields. Here are a few notable individuals: * Yonatan Bisk: Yonatan’s research interests include grounding, NLP in robotics, vision and language and unsupervised learning. * Graham Neubig: Neubig's research focuses on handling natural languages with computers with machine learning approaches that are both linguistically motivated, and tailored to applications such as machine translation and natural language understanding. * Jamie Callan: Jamie’s research and teaching focus on information retrieval and analysis. He has worked on a wide range of topics over the years, and he is particularly interested in search engine architectures, information filtering and text mining. * Daniel Fried: Daniel’s work focuses on enabling humans to use natural language to interact with computers to perform practical tasks in the world. Before reaching out to these professors, it is advisable to familiarize yourself with their recent papers and publications. This will provide you with valuable insights into their current research areas and enable you to engage in more informed discussions. Best of luck in your PhD application!

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Recommend me 10 famous comedies, their directors and the box office they earned

Here are 10 popular Hollywood comedies along with their directors and approximate worldwide box office earnings: 1. "The Hangover" (2009) - Directed by Todd Phillips Box Office: $467 million 2. "Bridesmaids" (2011) - Directed by Paul Feig Box Office: $288 million 3. "Superbad" (2007) - Directed by Greg Mottola Box Office: $170 million 4. "Anchorman: The Legend of Ron Burgundy" (2004) - Directed by Adam McKay Box Office: $90 million 5. "Knocked Up" (2007) - Directed by Judd Apatow Box Office: $219 million 6. "Step Brothers" (2008) - Directed by Adam McKay Box Office: $128 million 7. "Dumb and Dumber" (1994) - Directed by Peter Farrelly Box Office: $247 million 8. "Ghostbusters" (1984) - Directed by Ivan Reitman Box Office: $295 million 9. "Ace Ventura: Pet Detective" (1994) - Directed by Tom Shadyac Box Office: $107 million 10. "The 40-Year-Old Virgin" (2005) - Directed by Judd Apatow Box Office: $177 million

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Would a bullet made from ice be capable of killing somebody at 100 metres before melting?

The short answer is probably no. It would either shatter because of the amount of force the weapon puts on it or melt because of the heat (in case of a regular combustion gun). The former has more chance of happening, before the ice even has the time to start melting. The only way to shoot it without shattering it nor melting it, at least using weapons available to us, would be to use compressed air weapons, but it would need to be significantly powered down to prevent the bullet from shattering, so it would probably not be powerful enough to cause damage. The force needed to break through one square inch of ice is roughly 400 pounds on average. The bullet you're trying to fire is probably 9mm, but let's just calculate as though it was about one square inch (although it's actually quite smaller than that): those 400 pounds equal roughly 1800N. The force that comes out of a 9mm gun is approximately 383 ft-lbs, which equals to 520 newtons per metre. That amount is about 52000N per centimetre. One inch is about 2 and a half centimeters, so that means it's more about 20'800N per inch. As you can see, it's a lot more than what it takes to break ice. As for the "wall" towards which something has to be pushed in order to break it, the air will fulfill the role: the atmospheric pressure is about 15 pounds per square inch: it doesn't seem like a lot, but in the time it takes the bullet to win this force and gain momentum, it gets shattered by the enormous amount of energy produced by the weapon.

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What is the difference between a mode and a scale?

A **scale** is a sequence of ascending or descending unit pitches that form a palette of notes that can be used to form a melody. Most scales in Western music conform to a particular key; that is, a sequence of notes that will be sharp or flat by default. Not all scales have keys; the chromatic scale is a scale of all possible semitone steps used in Western music, while the whole-tone scale is a scale composed of intervals two semitones apart. Within a particular key, there are 7 notes in a single octave, before reaching the 8th note which is named the same as the first note and is at double the frequency. The seven notes have differing intervals between adjacent notes; sometimes it's one half-step (semitone), while other times it's a whole step (two semitones). The pattern of whole-step/half-step intervals that determine the notes of a key, starting from the note for while the key is named, is whole-whole-half-whole-whole-whole-half. Within a single key, each of those seven notes could be used as the base note of an ascending sequence. Each such sequence, created by starting on a different note in the key, is a **mode** of that key, and each mode has a name: * Ionian - starts on the tonic; the note for which the key is named. In the key of C, the Ionian mode starts on C. This mode is the most common, and colloquially called the **major scale**. The pattern is WWHWWWH. * Dorian - starts on the next note higher in the key than the tonic (D, in the key of C). WHWWWHW. * Phrygian - starts on the note one major third higher than the tonic (E). HWWWHWW. * Lydian - starts on the note one perfect fourth higher than the tonic (F). WWWHWWH. * Mixolydian - starts on the note one perfect fifth higher than the tonic (G). WWHWWHW. * Aeolian - starts on the note one major sixth higher than the tonic (A). In modern music, this mode is also very important, and is referred to as the **natural minor scale**. WHWWHWW. * Locrian - starts on the note one major seventh higher than the tonic (B). HWWHWWW.

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I want to learn watercolor painting, would you recommend hand painting or digital board painting?

Both traditional watercolor painting and digital watercolor painting exhibit distinct advantages and disadvantages. Traditional watercolor painting possesses a tactile essence and an organic aura, which captivate numerous artists. Engaging in this art form involves employing tangible materials such as paper, paint, and brushes, inducing a sense of relaxation and therapeutic solace. Moreover, it offers an outcome characterized by spontaneity and unpredictability, thus fostering excitement and a sense of unparalleled uniqueness. Conversely, digital watercolor painting offers an array of merits. It permits the ability to undo or redo actions, grants greater control over paint application, color blending, and facilitates the utilization of multiple layers for artistic endeavors. Furthermore, digital artwork can be effortlessly edited, adjusted, transformed, scaled, and shared, making it particularly advantageous for digital artists and illustrators. I would suggest exploring both traditional and digital methods if feasible, as this will enable you to gain a more comprehensive understanding of what resonates most harmoniously with you.

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How much does it cost to make a MOOC universally accessible, as defined by the Americans With Disabilities Act of 1990?

The cost of making a MOOC (Massive Open Online Course) universally accessible in compliance with the Americans with Disabilities Act of 1990 (ADA) can vary depending on several factors, such as the type of content the MOOC contains ( video / text / etc.). Meeting the Section 508* requirements for Web pages used in such a course is effectively without cost if one starts out to make such pages accessible. Retrofitting might cost as much as the original project, but the cost should be near zero for modern MOOCs. * Captioning and Transcripts: Closed (or open) captions are very expensive. Unless done at a foreign sweatshop, cost is $5.00 to $15.00 per minute, so something like $12,000 as a minimum, up over $35,000, for a one-semester course. In other words, the captioning can cost more than the professor. That's at least part of why some institutions employ ASL interpreters for class sections with deaf students. The $5-15 number given above could be reduced by using student labor, especially if the students are majors in the material being subtitled. In addition, captioning through voice recognition is getting much better, but still requires certain amount of manual editing. * Audio Descriptions: Making course materials available to the blind means being sure that everything that is shown is also described, either by the speaker who is presenting or in a manner that can be rendered through text-to-speech. The latter means being sure that there are good "alt" descriptions of images and that appropriate markup, e.g. MathML, is used for things like equations. In disciplines like computing, that isn't onerous, and the costs may disappear in the weeds of getting the course done. Things might be very different in a discipline like the visual arts. * Screen Reader Compatibility: Ensuring that the MOOC is compatible with screen readers and assistive technologies can involve additional development and testing efforts. This cost may vary depending on the complexity of the course platform and its current level of accessibility. It is recommended to consult with accessibility experts, organizations specializing in accessible design, or accessibility consultants who can provide more accurate estimates based on the specific requirements of your MOOC. They can conduct a comprehensive evaluation and provide cost estimates tailored to your project's needs.

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In Harry Potter And The Order of The Phoenix, Voldemort attempts to kill Harry in the Ministry after Sirius's death. Dumbledore arrives just in time to save Harry, shielding him with the wizard's statue. Why did he defend Harry there? He knew of him being a Horcrux after the attack on Arthur Weasley (on examining one of his instruments), and presumably knew he had to die at Riddle's hands. Why did he postpone the inevitable?

It's hard to give a definitive reason for a fictional character's motivations when they aren't explicitly described anywhere, but there are any number of reasons events may have unfolded as they did. 1. Dumbledore wasn't Voldemort-- he wasn't cool with murdering innocent people or allowing innocent people to die through inaction (certainly not in this phase of his life). He also showed a strong commitment to his students' safety and wellbeing, even in the case of a student that he knew for a fact was actively trying to murder him. Killing someone because it would be convenient or helpful is not a Professor Dumbledore move. 2. It's not clear how much information Dumbledore had on the Horcruxes at that point. It's easy for a reader to look back at the novels and determine that Harry was 100% fated to die at some point in the struggle against Voldemort, but that's not a great guide an in-universe character's knowledge and motivations. 3. Dumbledore was actively resisting Voldemort in every way he could manage at the time, and in particular wanted Voldemort's return to become public knowledge. It's not impossible that he viewed Voldemort's attack as an opportunity to injure, weaken, or otherwise frustrate Voldemort's efforts. At a minimum his approach was enough to force Ministry officials to accept that Voldemort was back, but it's also reasonable to think that if Voldemort clearly wanted something to happen, Dumbledore didn't want it to happen. 4. Voldemort was clever and dangerous, and one of the few things Dumbledore could be pretty sure he would do was hunt Harry. With Harry dead, Voldemort would become less predictable but no less dangerous. 5. Destroying all of the Horcruxes was important to defeating Voldemort but destroying any one was not-- that was the very reason Voldemort created so many of them. His being one seventh less immortal isn't an obviously huge setback for him, and indeed he did not seem to even notice that some of the Horcruxes were destroyed. 6. The difficulty around the Horcruxes was mostly in finding and gaining possession of them, because Voldemort had hidden them away and protected them. Harry himself, on the other hand, was generally pretty easy to find over the course of the novels. Even if Dumbledore felt that Harry would need to die, there wasn't any reason that this particular opportunity for him to do so was unique or rare.

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Three months ago, I submitted a manuscript to one of the most respected journals in my field. Today, I received comments from reviewers stating that my paper is not worth publishing in the journal. However, the editor decided to give it a major revision instead of outright rejection. Should I proceed to address all the questions posed by reviewers or should I just withdraw the paper and submit it elsewhere to save time?

Based on the description, I would advise you to sleep on it, suck it up, respond to the reviewers, revise the paper, and submit your revision to the journal. Yes, reviewers can be absolutely, disgustingly, and unnecessarily rude and mean. Read their review, filter their non-technical rants, keep whatever helpful criticism you can extract from their comments, and address them nicely and respectfully. It may actually be that the techniques you used were adequate but you failed to point out why and how it would be unnecessary to use more expensive methods. Always assume that they are right. If they are mistaken, respectfully point out in your response why you are right and edit the original manuscript to make the issue clearer to future readers. For instance, if the reviewer wrote: > The methods used in the paper are abysmal. The authors use an outdated and archaic method, which is also very uncertain, to measure the mass of the frogs, which is by weighting them on a scale. The atomic mass interferometer, which uses gravitational waves and is able to precisely infer mass with an uncertainty of one atomic mass unit per kilogram, is the state of the art in weighting. You can write as a response: * The reviewer is absolutely correct that atomic mass interferometry (AMI) is the state of the art in weighting. However, we opted to use analytical scales to measure the mass of the frogs because the mass variations that we expected to measure are of at least 1 g, a quantity signficantly higher than the uncertainty of even the most rudimentary analytical scales. We do, however, agree, that the quantum mechanical analysis of the molecular buildup in neural entangled channels in during frog electrophoresis, which is suggested as an interesting prospective investigation, will benefit from the low uncertainty provided by AMI. In order to make it clear that the methods used in our study were adequate, we have modified the original manuscript to include the following sentence in the second paragraph of page 5: While there are more precise methods to infer mass, such as atomic mass interferometry, analytical scales offer accuracies that are compatible with the 1 g mass variations that were found in this study (see Table 3, for instance).

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I was told in a Latin class that the name Christopher has Greek roots that mean "one who carries Christ". I assume that the Latin connection here is fero, which is the verb to carry. With that in mind, does the name Jennifer have a similar derivation? If so what would she be carrying?

It's a perfect example of a false cognate pair that is created by a sort of linguistic homogenization. When we come across foreign words, we pronounce them with our own sounds, mapping a foreign sound to one natural to our own ear that seems close enough for our purposes. Unrelated sounds and syllables from unrelated languages might in this way each get mapped to a single native sound/syllable. In this way, we come to hear the sounds and syllables as related when they are not. Mesoamerican languages, for instance, did not have a "v" sound. Consequently, when learning Spanish, the natives of Central America had a devil of time with the fairly common v sound and ended up usually pronouncing it as a b. The b sound is related to the v sound, so it wasn't a subtle shift. In consequence, very often to this day words like "votar" (to vote) get pronounced identically with words like "botar" (to throw out) giving rise to numerous puns. When native Spanish speakers from Latin America learn English, they are often heard saying things like "Thank you bery much," as a result. But "bery," and its false homophones "berry" and "bury" have no shared ancestry. As a last point of interest, consider English spelling. It is so difficult precisely because speakers of English and the academic sources that safeguard the English language (Oxford English Dictionary, Merriam-Webster Dictionary, etc.) have made a general decision to preserve as best as possible the original spelling of the words in their original languages, making only occasional modifications to bring them into some kind of conventional conformity. So the Greek suffix -φορος is conventionally transliterated as -pher, whereas the ending of Gwenhwyfar gets transliterated as -fer and the ending of aquifer stays as the Romans wrote it: -fer. This makes our spelling a bear to get a handle of, but it also locks the secret of most words' origins right into the words themselves. That means, once one has understood a bit of Latin, Greek, some common Celtic endings and a bit of German, one can almost always discern the origins of the word just by looking at it. Of course, it also means that we have to spend years and years memorizing spelling word lists and still relying on spellchecker far more than we care to admit.

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I was wondering about why we call TV and computer displays "screens", and couldn't find any clear etymology for the term's use for displays. My guess has to do with the hardware used in early displays. Perhaps the fields of tiny red, green, and blue cells looked like the screens used on windows and such, and the term stuck even as the hardware changed

The idea of a screen as an upright device, ornamental or protective against e.g. wind, fire, etc., goes back to the 14th century and earlier. And the sense of a screen as something for the projection of images derives from the fact that it was originally often a screen which was used for displaying objects for exhibition, pictures, photographs etc. The Oxford English Dictionary describes this meaning of screen in this way: > (b) Of images; e.g. a flat vertical surface prepared for the reception of images from a magic lantern or the like; spec. (i) a usually large white surface for receiving the image from a film projector; (ii) a small fluorescent screen, esp. one in a television set or a computer monitor; hence, the monitor itself; (iii) transf. (usually with def. article), moving pictures collectively; the cinema; the film world. The earliest reference they have to a screen as something for the projection of images dates from 1810: > 1810 New Family Receipt-bk. 257: To make Transparent Screens for the Exhibition of the Phantasmagoria. Apparently, people realise phantasmagoria was a form of image by magic lantern. So there we have it. This was the origin of TV screens.

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My wife and I have descended into the toddler years with our first. We have always been on the same page with each other whenever we correct bad behavior or instruct her on why a type of outburst is inappropriate. So this begs the question, will she feel like we are always ganging up on her? If we are both constantly correcting and instructing in tandem, is that bad? Should one parent act as an advocate while the other is tough on the rules? Should there be a good cop and a bad cop?

Classic good-cop-bad-cop is definitely wrong with a toddler because it involves a lot of lying. The bad cop threatens to beat the suspect up or otherwise do something cops are not allowed to do. The bad cop steps out and the good cop says "I'm on your side dude, but that guy is out of control and I don't know what he'll do next. Listen, if you just [....] I think I can get you out of this questioning session and maybe save your skin." Everything about this is a lie. The good cop isn't on the suspect's side, isn't trying to help the suspect, and knows full well the bad cop isn't ever going to hit, torture, or whatever the threat is. None of this is appropriate with your child. It is advisory to give away any thoughts of an adversarial stance. You want your child to learn to be in control and not to tantrum. You want your child to comply with reasonable requests, whether that's putting on an item of clothing, helping to clean up, not hitting, or anything else. When your child can do those things, not only will you be happier but your child will too. You don't need to break their spirit, make them give up their resistance, force them to do what you want. You need to show them how to do the things everyone wants them to learn to do. Nobody is a bad cop in that. Nobody is a good cop. You can love your child while you're putting something out of their reach. You can smile and cuddle someone as part of letting them know they are not allowed to do a particular activity. You can be happy and cheerful while carrying a shoeless coatless child to the car (with their shoes and coat in your hands for later) and explaining there isn't time to play on the way now. Whatever these rules are, they should be the rules FOR everybody and BY everybody. If the toddler can't eat before dinner, nor can Daddy. If feet aren't allowed on the couch then that's the rule, not just "if Mommy's looking." This kind of consistency isn't cruel or ganging up. You are showing your child the "laws of physics" of your home. This is how things go. Trying to understand mommy rules, daddy rules, sitter rules, grandparent rules - that's complicated! Remember, abiding by these rules isn't something mean or unfair, it's how life works in your house. And the toddler is trying to learn that. Make it as smooth as you can, and that includes being consistent, and not seeing the rules as mean.

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Temperature conversion: $$273 + \text{degree Celsius} = \text{Kelvin}$$ Actually why is that $273$? How does one come up with this?

One Celsius (or Kelvin) degree as a temperature difference was defined as 1/100 of the temperature difference between the freezing point of water and boiling point of water. These points are called 0 °C and 100 °C, respectively. The number 100 arose because we're used to numbers that are powers of ten because we use the base-ten system. The Celsius degree is "one percent" of the temperature difference. There also exists the minimum temperature that one may achieve. In Kelvin degrees, it's sensible to call this minimum 0 K: that's a primary condition on the "natural" temperature scales such as the Kelvin scale. If one insists that one Kelvin degree is equally large as one Celsius degree as a unit of temperature difference, it just turns out that the melting point of ice has to be 273.15 K and the boiling point of water is 373.15 K. It's because the temperature difference between the boiling and freezing points is 2.7315 times smaller than the temperature difference between the minimum allowed temperature, the absolute zero, and the freezing point of water. The value 2.7315 cannot be easily explained in simple words. It represents a specific characteristic related to water, a natural phenomenon that arises from the principles of quantum mechanics. To understand this value, extensive simulations are required to analyze the behavior of water molecules across a wide range of temperatures. Through experimental evidence, we have confirmed that this value accurately reflects the properties of water.

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I am from Kenya. Can I travel to the Netherlands to seek asylum with out a visa, because I want to seek asylum? Will Kenya Airways allow me to board a plane with out a visa to Schiphol Airport, considering I have my passport?

The answer appears to be no: it is extremely unlikely that the airline will allow you to board. A Kenyan citizen who wishes to enter the Netherlands must have a visa, proof of sufficient funds to cover their stay, and documents necessary for entry to their next destination. What's more, airlines are required to give special scrutiny to passengers from Kenya: > Airlines flying from the following airports to the Netherlands: Abu Dhabi (AUH), Accra (ACC), Bahrain (BAH), Beijing Capital (PEK), Boryspil (KBP), Cairo (CAI), Damman (DMM), Dar Es Salaam (DAR), Dubai (DXB), Entebbe (EBB), Guangzhou (CAN), Hong Kong (HKG), Hamad (DOH), Istanbul Ataturk (IST), Istanbul Sabiha Gokcen (SAW), Johannesburg (JNB), Kigali (KGL), Kilimanjaro (JRO), Kuala Lumpur (KUL), Kuwait (KWI), Lagos (LOS), Moscow Sheremetyevo (SVO), Muscat (MCT), Nairobi (NB ), New Delhi (DEL), Sao Paulo (GRU), Singapore (SIN) and Teheran (IKA) must provide copies of travel documents of all passengers on these flights in case they do not hold proper travel documents upon arrival i the Netherlands and are inadmissible. Copies must include the data page of the passport/travel document, the page with the visa and the page with departure/clearance stamp, where applicable. Non-compliance with these entry regulations will result in fines up to EUR 11,250.– per passenger for the carrier. As you can see from the last sentence, the airline will have a strong incentive to check your travel documents before you board the plane.

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Apparently, the air inside a soap bubble is under higher pressure than the surrounding air. This is for instance apparent in the sound bubbles make when they burst. Why is the pressure inside the bubble higher in the first place?

The increased pressure is caused by the surface tension between the soap and the surrounding air. This can be seen by a simple equilibrium energy argument. The total energy of the system reads $$ E = E_i + E_o + E_s \;, $$ where $E_i$ is the energy associated with the air inside the bubble, $E_s$ is the interfacial energy, and $E_o$ denotes the energy associated with the air outside of the bubble. Importantly, the contribution of the surface energy is given by $E_s = 2 \gamma A$, where $\gamma$ is the surface tension and $A$ is the surface area of the bubble. The factor of 2 emerges, since there are actually two interfaces (one facing the inside of the soap bubble and one facing the outside). In equilibrium, the total energy will be minimal. We thus analyze the total differential of the energy. Here, the differentials of the partial energies of the air can be approximated by the ideal gas law, which yields $dE_i = -p_i dV_i$ and $dE_o = -p_o dV_o$. Next, we have to discuss the degrees of freedom of the system. Generally, the soap bubble wants to keep its spherical shape to minimize the surface area (and thus the surface energy $E_s$) at a given volume. This leaves us with a single parameter, the radius $R$ of the bubble, which can be varied in any process. The volume differentials then become $dV_1 = 4\pi R^2 dR$ and $dV_2 = -4\pi R^2 dR$. Additionally, the surface area changes by $dA = 8\pi R dR$. The differential of the surface energy thus reads $dE_s = 2\gamma 8\pi R dR$, provided that the surface tension stays constant. Now we got everything and can express the differential of the total energy as $$ dE = -p_i 4 \pi R^2 dR + p_o 4\pi R^2 dR + 2\gamma 8\pi R dR \;. $$ Dividing by $4\pi R^2$ and noting that $dE/dR$ vanishes in equilibrium, we thus arrive at $$ p_i - p_o = \frac{4\gamma}{R} \;. $$ This expression shows that the pressure inside the bubble is large than outside. The pressure difference is two times the Laplace pressure $2\gamma/R$.

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Resistance is due to collision with protons, and pretty much everything contains protons. So technically is everything a resistor? (Or at least, can anything be a resistor?)

First, regarding "resistance is due to collision with protons" in your question: Actually, there are lots of materials which don't contain protons outside of atomic nuclei — e.g. steel, glass, oxygen — but all these do have resistance. Dominant factors determining resistance vary from material to material: these can be scattering of electrons/holes by motion of atomic nuclei (i.e. by phonons), by point-like defects in the crystals, etc.. Scattering by protons you mention is a very specific case of scattering by impurities (crystal defects). Second, regarding "technically is everything a Resistor?(or atleast, anything can be a Resistor?)" in your question: Yes, anything can be a resistor, in suitable conditions. One important property of a resistor is that it obeys Ohm's law. If you apply too high voltage to e.g. pure silicon, its conductivity will abruptly increase due to electrical breakdown. In this range of voltages the piece of material shouldn't be considered a resistor. Or if you take a piece of mercury, cool it down below 4.2 kelvins, its resistivity will become exactly zero (superconductivity), after which it can't be considered a resistor. Similarly with other materials – in the right conditions they'll be good enough resistors, outside of these conditions they aren't.

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How do I remove a Git submodule?

In modern git, this has become quite a bit simpler: * Run `git rm <path-to-submodule>`, and commit. This removes the filetree at `<path-to-submodule>`, and the submodule's entry in the `.gitmodules` file, i.e. all traces of the submodule in your repository proper are removed. However, the `.git` dir of the submodule is kept around (in the `modules/` directory of the main project's `.git` dir), to make it possible to checkout past commits without requiring fetching from another repository. If you nonetheless want to remove this info, manually delete the submodule's directory in `.git/modules/`, and remove the submodule's entry in the file `.git/config`. These steps can be automated using the commands: * `rm -rf .git/modules/<path-to-submodule>`, and * `git config --remove-section submodule.<path-to-submodule>`.

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Why aren't python nested functions called closures?

A closure occurs when a function has access to a local variable from an enclosing scope that has finished its execution. For example, ``` def make_printer(msg): def printer(): print(msg) return printer printer = make_printer('Foo!') printer() ``` When `make_printer` is called, a new frame is put on the stack with the compiled code for the `printer` function as a constant and the value of `msg` as a local. It then creates and returns the function. Because the function `printer` references the `msg` variable, it is kept alive after the `make_printer` function has returned. So, if your nested functions don't * access variables that are local to enclosing scopes, * do so when they are executed outside of that scope, then they are not closures. Here's an example of a nested function which is not a closure. ``` def make_printer(msg): def printer(msg=msg): print(msg) return printer printer = make_printer(&quot;Foo!&quot;) printer() # Output: Foo! ``` Here, we are binding the value to the default value of a parameter. This occurs when the function `printer` is created and so no reference to the value of `msg` external to `printer` needs to be maintained after `make_printer` returns. `msg` is just a normal local variable of the function `printer` in this context.

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