I just would like to know the reason why a question I formulated was down voted.
Note: If you're looking for a simple explanation as to why comments aren't required on downvotes, see .   I used to get "upset" (though that is too strong a term) when I got downvoted without comment. If my answer isn't good enough then I'd like to know why. Not only does it improve the answer for the OP but it improves my knowledge too.  Where the down-vote has been explained I've found it useful &amp; it has improved my answer, or forced me to delete the answer if it was totally wrong.  So is there any way we can encourage people to leave a comment? Perhaps they don't lose rep if they explain their down-vote?  I must admit though that I haven't always explained my down-vote either so you could call me a hypocrite. I've also grown a thicker skin over the months of using SO (it seems to have come with the higher rep score ;-)), so I'm less bothered about this now.
One-byte-off pointer still valid in C? How do I get the CPU temperature? How do I get the CPU temperature? Why does "kill -9 0" end my console session? I just wonder why kill -9 0 ends my tty console session?   What exactly is PID 0, it is not listed on a ps aux? Generating a range of numbers in MySQL How do I generate a range of consecutive numbers (one per line) from a MySQL query so that I can insert them into a table?  For example:  nr 1 2 3 4 5   I would like to use only MySQL for this (not PHP or other languages). Every affine variety in $\mathbb A^n$ consisting of finitely many points can be written as the zero locus of $n$ polynomials I am reading Gathmann's free online notes on Algebraic Geometry. One exercise asks to show that     "Every affine variety in $\mathbb A^n$ consisting of finitely many points can be written as the zero locus of $n$ polynomials".    There is a hint says "interpolation". I don't know how to start with the hint.   If $n=2$, we can use interpolation to get 1 polynomial for finitely many points. But we need to show 2 polynomials instead. I am also not sure how to apply interpolation for higher dimensions. Anyone can help? Thank you! Simple regular expression for a decimal with a precision of 2 I'd like to add an invisible watermark to each PDF document that I produce so that in case it leaks, I know where it leaked from. Anyone knows what would a good way for an invisible watermark be in a PDF document and how to add one? How to find all the available tools in mac terminal? I am trying to setup a bunch of development projects in my Mac. I have to run various tools like python, ruby, scala, groovy etc.  To see if a tool is available I use options like   ruby --version.    Instead I would like to see all the list of tools available in Mac terminal via a single command. What is the command/options for it? I want to have a script that takes the current working directory to a variable. The section that needs the directory is like this dir = pwd. It just prints pwd how do I get the current working directory into a variable? May $y=e^x$ be satisfied with both $x$ and $y$ be positive integers?  I think it is not possible as $e$ ,a transcendental number, when multiplied by itself would never result in rational number.  Am I right? Got a new iPhone - where am I supposed to receive the verification code? Safest way to transport a laptop during flight I flew a long range flight carrying my laptop, a quite heavy one, inside a neoprene briefcase in the passenger cabin. The recommendation by the aircrew was to place it in the overhead compartment or under the seat in front of me. However, during take-off and landing, the vibrations on the plane are quite strong and, as a result, it received minor damage.   Placing them in the overhead compartment might be equivalent to placing it on the floor under the seat, with the added issue of additional luggage in the compartment shifting.  I considered the alternative of holding the laptop by the handle while sitting, so it won't be any contact with the aircraft's floor. This is impracticable during cruise, but I thought it could be better during the take-off and landing segments. Another option I considered is to wrap it with completely with bubble wrap before boarding the plane.   Which is the safest way to transport a laptop during flight? Bold name in bib when having a prefix in last name How can I get rid of those little white dots? I am using Blender 2.70a. Regular Expressions: Is there an AND operator? Obviously, you can use the | (pipe?) to represent OR, but is there a way to represent AND as well?  Specifically, I'd like to match paragraphs of text that contain ALL of a certain phrase, but in no particular order. What happens if 2 separate abilities require you to sacrifice a creature? Prove that the unit circle, $S^1:=\{(x,y)\in \mathbb{R}^2: x^2+y^2=1\}$, Is a one-dimensional manifold I want to enable gzip compression for acethehimalaya.com. Can anybody please tell me what is the best way of achieving compression in an Apache Webserver? Kelvin Source Terminal on MOSFETs On MOSFETs with multiple source pins, is the so-called &quot;Kelvin-connected source pin&quot; connected any different internally? Or is it just like every other source pin?   EDIT: Just to be clear, I am not asking what the Kelvin connection is for. I'm asking whether it is physically implemented any differently than the other source pins or whether it is just an extra regular, old source pin. When editing a profile’s “About me” section, or a tag wiki, and hitting CtrlG, or clicking the “Image” button from the formatting bar to insert an image, the Imgur upload modal dialog will appear. The same modal will also appear when uploading a profile picture. This is different from questions and answers where an uploader overlay bar (technically referred to as inline-dialog) appears. This modal dialog has an × button for closing, but it does nothing when clicked. I also can’t try tabbing to it and hit Enter, because it’s a regular &lt;div&gt; with no tabindex attribute, so it’s not tabbable and not an interactive element. (After manually inserting a tabindex and pressing Enter, it also did nothing, of course.)  There are no errors produced in the console of any browser. It doesn’t even seem to have any event listener bound to it. Pressing the Esc key or clicking outside of the modal dialog will dismiss the dialog, but the × button is currently useless. An obvious possible  would be to unify all Imgur upload dialogs to the way they appear on questions and answers, as an inline-dialog. But for the profile picture uploader, this dialog doesn’t have an obvious alternative, so in this instance, it’s necessary to redesign the close button so that it acts as a normal button (interactive element, tabbable) and closes the modal popup.  Related   and  — showing this modal in action; closing it used to work.  — for an older dialog design.