Should all fields in a web form be the same length?
Should I vary input field lengths in a single page checkout form?
Is there any shortcut/easy way to switch this system proxy settings? Should you use a plural verb if you refer to a fraction?     Nine tenths of the pillar have rotted away.   I think has should be used here, but I'm not sure. How to convert milliseconds into human readable form? I need to convert an arbitrary amount of milliseconds into Days, Hours, Minutes Second.  For example: 10 Days, 5 hours, 13 minutes, 1 second. I'm using Lubuntu for a while now, but found a couple of details that I wanted to view with Unity (that's another story).  Ok, the thing is: I've tried on a VM with Lubuntu to install Unity (sudo apt-get install unity) When the installation is over. I selected in the Lubuntu login Unity/Unity2D but did not work.  Right now I'm installing ubuntu-desktop, I am presuming that will work, but also it will change my login for example.  Is there a way to do a "clean" installation of Unity but not make major changes on my Lubuntu?  I would prefer Gnome-Shell instead of Unity. Using expect to pass a password to ssh Why bosons have integer spin and fermions have half-integer ones? Due the fact that the fermions are the "block particles" and the bosons are the "carriers" I just came out with the question that, why the "block particle" have half-integer spin and the "carriers" have an integer spin? Is it true that $\mathbb{R}$ and $\mathbb{R}^2$ are isomorphic as abelian groups? I think the answer is yes.   Sketch of the proof Consider $\mathbb{R}$ as a vector space over $\mathbb{Q}$. Let $\{e_\lambda:\lambda\in\Lambda\}\subset\mathbb{R}$ be its Hamel basis. Then $\{(e_{\lambda_1},e_{\lambda_2}):\lambda_1,\lambda_2\in\Lambda\}\subset\mathbb{R}^2$ is a Hamel basis of $\mathbb{R}^2$. Consider set theoretic bijection $i:\Lambda\to\Lambda\times\Lambda$ define map $\varphi:\mathbb{R}\to\mathbb{R}^2$ by its action on element of Hamel basis of $\mathbb{R}$ by equality $\varphi(e_\lambda)=(e_{i(\lambda)_1},e_{i(\lambda)_2})$. This is an isomorphism between $\mathbb{Q}$-vector spaces $\mathbb{R}$ and $\mathbb{R}^2$.  Question Could you tell me is this proof correct, and if it is not, where is the mistake?  EDIT: Thanks to GAJO we found that this proof is wrong. The correct one basis is  $$ \{(e_\lambda,0):\lambda\in \Lambda\}\cup\{(0,e_\lambda):\lambda\in\Lambda\} $$ So we had to look at bijections of the form $i:\Lambda\to\Lambda\coprod\Lambda$ and the desired linear operator is defined by equalities $\varphi(e_\lambda)=(e_{i(\lambda)},0)$ if $i(\lambda)$ lies in the first copy $\Lambda$ and $\varphi(e_\lambda)=(0,e_{i(\lambda)})$ otherwise. bash command for each file in a folder I have a set of files on which I would like to apply the same command and the output should contain the same name as the processed file but with a different extension.  Currently I am doing rename /my/data/Andrew.doc to /my/data/Andrew.txt I would like to do this for all the .doc files from the /my/data/ folder and to preserve the name.  I tried several versions but I guess I have something wrong in the syntax as I an new to linux. Subspaces of separable normed spaces Let $X$ be a separable normed space. Is it true that every subspace is separable? If it was Hilbert space I would take the dense set and then their projections.  It sounds trivial but I cannot prove or disprove it...  Thank you. How can I create a zip archive of a whole directory via terminal without hidden files? I have a project with lots of hidden folders / files in it. I want to create a zip-archive of it, but in the archive shouldn't be  any hidden folders / files. If files in a hidden folder are not hidden, they should also not be included.  I know that I can create a zip archive of a directory like this:  zip -r zipfile.zip directory   I also know that I can exclude files with the -x option, so I thought this might work:  zip -r zipfile.zip directory -x .*   It didn't work. All hidden directories were still in the zip-file. Do you use "a" or "an" before acronyms / initialisms? 99% of the time, I'm clear on when I should use "a" versus "an." There's one case, though, where people &amp; references I respect disagree.  Which of the following would you precede with "a" or "an," and why?   FAQ FUBAR SCUBA   [Note: I've read the questions  and , but the rules given there don't necessarily apply here.]    [Edited to add]  Here's a shorter (and hopefully clearer) version of the question…  In written English, which is correct (and why): "a FAQ" or "an FAQ"?  Some references with differing opinions:   an: the  and  a: the Microsoft Manual of Style for Tech Publications, 3e either: the  and Must present perfect tense be used if the action takes place more than once? I was told that if an action is completed once in the past, the simple past is used. Ex:  I saw that movie.  If the action is completed more than once, the present perfect tense must be used. Ex:  I have seen that movie twelve times.    So, "I have seen that movie twelve times on Tuesday." is correct and "I saw that movie twelve times on Tuesday." is incorrect? Particle effect showing only on one side of mirrored object I'm trying to create a fur particle effect on sonic the hedgehog, and I'm using weight paints to keep it in the areas I want.   Problem: I can only get the hair effect to show up on certain random areas on model, and only on one side.  I'm using a mirror effect to keep model symmetrical, but hair only shows on one side of the mirror.  I'm new used Blender, so I don't know what all the settings for the particle effects do.  Whats going on and how do I fix it? How to automatically install entire Google Web Fonts collection? Why can't we use double pointer to represent two dimensional arrays? Print lines between (and including) two patterns Why is unity feedback used? Best option to export more than 15 millions records from Salesforce? We have a requirement to export around 15 millions records.   Which option will be better Salesforce DataLoader or Jitterbit Cloud DataLoader or any other better option available.  Can we export around 15 millions or more records in one go ! is it possible ? will CSV file able to handle that many record if exported in one go.  Also can we do this using Report API wherein we can create a report and fetch reports data using API, is it advisable considering volume of data?  Please advise the best option to go with, for exporting large volume of records from Salesforce. Full Name Requirement of Commit Phase The Commitment form on Area 51 requires your full name to be provided. Is this publicly viewable? Why not just use the existing usernames? Lightning: why can you not have an expression combined with text in an HTML attribute? So, I've been struggling with this for a while, trying to figure out how to get it to work. Here is what I originally did:  &lt;button class="btn btn-primary {!v.isLink1 ? 'active' : ''}"&gt;   And so on. Here's the documentation on it.   However, when you actually try to save this in the developer console, you get the error:  Field Integrity Exception: Failed to save undefined: Cannot mix expression and literal string in attribute value, try rewriting like {!'foo' + v.bar}: Source   I finally figured out that you have to put all of the classes inside of the expression, like so:  &lt;button class="{!v.isLink1 ? 'btn btn-primary active' : 'btn btn-primary'}"&gt;   This doesn't seem very intuitive. It's also not documented anywhere I could find. Could someone explain to me why it is this way and if it will ever change?   (and hopefully this question saves someone some headaches in the future)