Before the SE topbar was implemented, there was a hottest-questions-across-the-network feature I was quite fond of. Where did this feature go? Was it completely wiped out?  I'm sad to see it go.
Since the new top bar has been rolled out - a number of different people, established and new users alike, have asked questions on where a specific link has disappeared to with the new top bar design. Where has the link to &lt;X&gt; gone?
I'm looking for the method by which the partial derangement formula $D_{n,k}$ was derived. I can determine the values for small values of N empirically, but how the general case formula arose still alludes me.  Any links/books or an explanation will be appreciated.  The formula is:  $D_{n,k} = {n \choose k}!(n-k)$  Links: ensurepip is disabled in Debian/Ubuntu for the system python I am trying to make a virtual environment for the development of my Django application. The commando's which I am using:   vagrant@vagrant:/var/www/djangogirls$ python3 -m venv myvenv The virtual environment was not created successfully because ensurepip is not available.  On Debian/Ubuntu systems, you need to install the python3-venv package using the following command.      apt-get install python3-venv  You may need to use sudo with that command.  After installing the python3-venv package, recreate your virtual environment.  Failing command: ['/var/www/djangogirls/myvenv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']   vagrant@vagrant:/var/www/djangogirls$ sudo apt-get install python3-venv Reading package lists... Done Building dependency tree        Reading state information... Done python3-venv is already the newest version (3.5.1-3). The following packages were automatically installed and are no longer required:   javascript-common libjs-jquery libjs-sphinxdoc libjs-underscore python-pbr python-pkg-resources   python-six python-stevedore python3-virtualenv virtualenv virtualenv-clone Use 'sudo apt autoremove' to remove them. 0 upgraded, 0 newly installed, 0 to remove and 108 not upgraded.  vagrant@vagrant:/var/www/djangogirls$ python3 -m ensurepip ensurepip is disabled in Debian/Ubuntu for the system python.  Python modules for the system python are usually handled by dpkg and apt-get.      apt-get install python-&lt;module name&gt;  Install the python-pip package to use pip itself.  Using pip together with the system python might have unexpected results for any system installed module, so use it on your own risk, or make sure to only use it in virtual environments.   vagrant@vagrant:/var/www/djangogirls$ rm -r myvenv/   vagrant@vagrant:/var/www/djangogirls$ python3 -m venv myvenv The virtual environment was not created successfully because ensurepip is not available.  On Debian/Ubuntu systems, you need to install the python3-venv package using the following command.      apt-get install python3-venv  You may need to use sudo with that command.  After installing the python3-venv package, recreate your virtual environment.  Failing command: ['/var/www/djangogirls/myvenv/bin/python3', '-Im', 'ensurepip', '--upgrade', '--default-pip']   As you can see, I am trying to make a myvenv, which cannot be created due to the python3-venv missing. I have already installed this, but the ensure pip is missing. After searching it seems that the system (Ubuntu 16.04) discourages the usage of the package. Could someone help me work around this problem? Why didn't Umbridge succeed in Slytherin? The new information released about Umbridge on Pottermore on Halloween was interesting in that it demonstrated how insidiously Dolores Umbridge applied her ruthless ambition over the years. From making her half-blood family disappear from public view, to oozing her way through the Ministry and up the ladder of success, basically unfettered -- although no one liked her as a person, despite her saccharine demeanor -- this woman was over and again awarded significant positions of power where she could do tremendous damage to others.   Some might see these as Slytherin traits. Some. &lt; shifty eyes > So I was surprised to read that while Umbridge was a Slytherin student at Hogwarts, she was consistently overlooked for positions of power and prestige within Slytherin itself.   Why didn't Umbridge succeed in Slytherin?  RESOURCE: Pottermore on Dolores Umbridge:  , Why do we use the simple past but not the present or future in the following expressions:  Don't you think it's time we went a little further Don't you think it's time we ate Don't you think it's time we went home I have had no problems exporting .fbx files for Unity except recently some of my .fbx started to rotate the mesh. The asset is correctly oriented, but the mesh is rotated 90 degrees. Is there an explanation and fix for why this happens sometimes, and works properly otherwise? How to detect using c# if a pendrive is plugged into a USB port? Is there a way to find out when in a LAN anyone plugs in a pendrive to the USB port?  Programatically (in C# preferably) or through some tool. Basically I'd imagine a client application sits on each terminal and monitors the USB ports and sends the information to the server.   a.) Can I get the details of the file(s) being copied? b.) Is there a way to do this without a client application?   EDIT  I dont want to disable the USB port entirely. its to be on a need to have basis. Basically just want the users on the LAN to share data responsibly and know that whatever data is tranfered is monitored and logged and can be questioned later. VLC will not install How do I get my PCs to not be a bunch of murderous cretins? Most RPGs teach you that casual violence is the best solution to all your in-game problems. This is so well established a part of the vast majority of RPGs that there are entire satire RPGs like Greg Costikyan's  and John Tynes'  dedicated to showcasing the issue. Even now that the '80's anti-RPG hysteria is past, you see more sober critiques of endemic violence in RPGs in places like . In most RPGs, PCs become inured to murder and other antisocial activities very quickly, and enter the depths of depravity that wouldn't be appropriate in the worst parts of the world. Armed robbery, mass murder, and genocide become routine parts of an adventurer's day, something only stick-in-the-mud characters with the most extremely stated ethics object to. , even though it is not properly applied to just any conflict, is a PC's friend and they generally escalate any conflict in that direction. The sophistication of the gamer mindset towards introspection on this issue can be demonstrated in that the most meaningful question usually debated about in-game violence is some variant on &quot;but should we kill the noncombatant children&quot; or &quot;can we just murder people out of hand as long as they're from a typically evil race?&quot; In the real world, we generally a priori regard anyone having to have this discussion as a monster already. (P.S. The &quot;wipe out a given evil race&quot; thing isn't the point of this question; it is only mentioned to indicate that it's only &quot;that far&quot; that usually causes ethical handwringing from players, when that is a really quite extreme case and we should be uncomfortable with casual violence a lot sooner. ) What I'd like to have is a more realistic in-game treatment of conflict.  People getting wounded and giving up, taking and ransoming of prisoners, not always escalating a fistfight to weapons, not always escalating weapon combat to killing, etc.  Heck, as I write this, I'm watching an episode of Adventure Time with my daughter and the protagonists snuck in and rescued a princess kidnapped by the Ice King and then exit right next to his sleeping form. I thought, &quot;If this were D&amp;D they'd all be carefully coordinating a coup de grace to kill him in his sleep on the grounds that he inconvenienced them.&quot;  The problem isn't limited to D&amp;D of course, sci-fi PCs are happy to neutron bomb planets for convenience too, for example. I'm not part of the &quot;D&amp;D is Satanic&quot; crowd obviously, but I frankly do have compunctions about continually playing in games where the taught behavior is uncomfortably equivalent to the worst examples of human behavior we see on the nightly news. How can I give my PCs a newfound respect for human life? Is there a W3C valid way to disable autocomplete in a HTML form? When using the xhtml1-transitional.dtd doctype, collecting a credit card number with the following HTML  &lt;input type="text" id="cardNumber" name="cardNumber" autocomplete='off'/&gt;   will flag a warning on the W3C validator:     there is no attribute "autocomplete".   Is there a W3C / standards way to disable browser auto-complete on sensitive fields in a form? Make HttpURLConnection load web pages with images Unix separation of specific numbers from Column How can I separate specific numbers from a column and add it to a new file? For example, take all numbers that are "134" from column 3, I tried using   awk '$3 == 134" file.txt   but it didn't work, also tried using   awk -F, '{print $3 == 134 }' file.txt    didn't work.  Pink          132           134 Blue          189           167 Yellow        2000          134 Green         678           145 Black         789           145 White         780           135   So the new file will contain just the following   Pink          132           134 Yellow        2000          134 How do you run update-grub? Prove that $\frac{(n-2)s^2}{\sigma^2}\sim \chi^{2}_{n-2}$ Long-distance movement arrow in gloss I have a question on drawing an arrow using gb4e. Currently, I am trying to use the method described in the link below. The problem takes place when I draw the long distance arrow like (5). As you can see the picture below, the line cross over the gloss. I would like to draw the horizontal line like the example (1). How can I evacuate the crossing?    \documentclass[11pt, dvipdfmx]{article} \usepackage{tikz} \usetikzlibrary{calc} \newcommand\tikzmark[1]{\tikz[remember picture, baseline=(#1.base)] \node[anchor=base,inner sep=0pt, outer sep=0pt] (#1) {#1};}  % This code from http://tex.stackexchange.com/q/55068/2693 \tikzset{     ncbar angle/.initial=90,     ncbar/.style={         to path=(\tikztostart)         -- ($(\tikztostart)!#1!\pgfkeysvalueof{/tikz/ncbar angle}:(\tikztotarget)$)         -- ($(\tikztotarget)!($(\tikztostart)!#1!\pgfkeysvalueof{/tikz/ncbar angle}:(\tikztotarget)$)!\pgfkeysvalueof{/tikz/ncbar angle}:(\tikztostart)$)         -- (\tikztotarget)     },     ncbar/.default=0.5cm, }  % Thanks to Paul Gessler adn Percusse for code improvement here \newcommand{\arrow}[2]{\begin{tikzpicture}[remember picture,overlay] \draw[-&gt;,shorten &gt;=3pt,shorten &lt;=3pt] (#1.base) to [ncbar=\arrowht] (#2.base); \end{tikzpicture} \setlength{\arrowht}{0ex} } \usepackage{gb4e} % The following code modified from  % http://permalink.gmane.org/gmane.comp.tex.linguistics/1036 % This adds some extra space after the first line \newlength{\arrowht} \setlength{\arrowht}{0ex} \newcommand*\cgdepthstrut{{\vrule height 0pt depth \arrowht width 0pt}} \renewcommand\eachwordone{\cgdepthstrut\rmfamily} \renewcommand\glt{\vskip -\topsep} \let\trans=\glt \newcommand\arrowex{\setlength{\arrowht}{2.5ex}\ex}   \begin{document} \begin{exe} \ex\label{scramble-det} \begin{xlist}         \arrowex          \gll          \ldots dat Jan \tikzmark{een} auto gisteren \tikzmark{t}  gekregen heeft.\\         \ldots that John a car  yesterday t gotten has \\         \ldots that John a car yesterday.         \arrow{t}{een} \end{xlist} \end{exe}  \begin{exe} \ex\label{scramble-dets} \begin{xlist}         \ex          \gll          \ldots dat Jan een auto gisteren t gekregen heeft.\\         \ldots that John a car  yesterday t gotten has \\         \ldots that John a car yesterday. \end{xlist} \end{exe}  \begin{exe} \ex[]{     \gll     John-wa totetumonaiukurai baka-da.    \\     John-Top very stupid-cop \\     `John is very studip.'     }  \ex[]{     \gll     John-wa totetumonaiukurai dousiyoumonai tondemonai sukuigatai baka-da.    \\     John-Top very very very very stupid-cop \\     `John is very studip.'     }  \arrowex[]{     \gll     \tikzmark{John}-wa totetumonaiukurai dousiyoumonai tondemonai sukuigatai  \tikzmark{t} baka-da.    \\     John-Top very very very very stupid-cop \\     `John is very stupid.'         \arrow{t}{John} }  \end{exe}  \end{document} How is the recommended next badge determined exactly? According to , the     "Progress to next badge" bar automatically selects the badge you're closest to earning (or that's most logical to go for next)   While "the badge you're closest to earning" is pretty easy to determine: it's the bar with the most progress, I'm wondering what "most logical to go for next" means. Because right now on Meta Stack Exchange, I can track two badges: Illuminator and Legendary. My progress for Illuminator is 66.40% and for Legendary it's 66.67%, yet Illuminator is shown as the recommended next badge:    On some child metas where I barely have any activity, Student is shown as recommended next badge with a progress of 0/1, but I do have cast some votes so I have a small progress towards e.g. Civic Duty. So obviously there is some other logic at work, but what? What is the proper name for a "river plot" visualisation In a famous plot, Charles Minard visualised the losses of the French Army in the Russian campaign of Napoleon:    (another nice example is  xkcd plot)  Is there a canonical name for this type of visualisation? I'm actually looking for an R package to create such plots, but I don't even know how to look for it.  EDIT:  As I could not find a good package in R do do this type of plots, I have created my own, called "riverplot" -- you can download it . Here is a simplified version of the above diagram:    And an example of what other diagrams can be created with the package: How do I prevent mouse movement from waking up a suspended computer? I want to do the not independent sign in latex without having to install or define new commands (since I am using latexIT and I cannot load new packages).  Currently I use the following sign for independent:  X{\perp\!\!\!\perp}Y   What can I use for X not independent of Y?  I.e., something like this: ? What happens to Bucky's arm at the end of Infinity War? Bucky (Winter Soldier) has a metal arm (possibly made from vibranium?) but it's an attachment to his body as far as I understand. Why, when Thanos destroys half of the universe at the end of Infinity War, does his metallic arm also disappear with him? Shouldn't it be left behind as his gun did? Possible Duplicate:          On Windows I am able to switch between keyboard layouts by pressing Alt+Shift. Is there a similar keyboard shortcut in Ubuntu?