Is it safe to reuse an image from an older post? Suppose I made a post which contains an image (which I uploaded the usual way using the uploader in the editor). Many months later, I decide to make another post using the image from the earlier post. Is it safe to reuse an image that was previously uploaded as part of an older post? I don't want my new post to have broken images in the future.
Will links to images be kept permanently when added to a comment and nothing else? I assume, that Stack Exchange have some clean-up subsystem, which deletes all "abandoned" images (stored at i.stack.imgur.com), that is, all of them, that were initially uploaded, but no post is actually having link to them. Am I right?  If such subsystem is implemented and is doing its job on regular basis, then what about following scenario:   Start a new question or answer, anywhere. Hit button and upload an image. Copy generated image's URL  to clipboard. Close tab and drop editing post. Go to question on answer, you actually planned to reply. Post a comment to it and paste copied image's URL from clipboard to comment's body.   Will uploaded image, with URL pasted only to comment, be kept permanent? Does clean-up subsystem (if exitst) take care of checking for image's URLs in comments as well?
"does not contain a static 'main' method suitable for an entry point" How can a company use money from stock investors when they are constantly being bought and sold? I am interested in the mechanisms which a company can use the money that investors give them when they buy a public stock since they are being bought and sold constantly. How can a company spend other people's assets when the shareholders still own their stocks and they still retain a liquid value? To me it seems like stocks are a case of "having your cake and eating it too". I have a simular issue to the question asked in :  I have tried the solution provided by Jake. This makes that my picture fails to resize (scale) as i intend.  Whether i give Set scale=0.4 or Set scale=0.8 The size of the  picture remains the same  This is the code i use:  \begin{figure}[ht!] \centering \begin{tikzpicture}[Set scale=0.4, every node/.append style={transform shape},] % STYLES \tikzstyle{every node}=[rectangle,rounded corners, minimum width=100pt,     align=center,node distance=3cm,fill=black!10,inner sep=5pt,text width=3cm,minimum height=1.75cm,&gt;=stealth,text badly centered] % Draw forces \node [force, above of=rivalry] (top) {Firm strategy, structure and rivalry}; \node [force, left=1cm of rivalry] (left) {Factor conditions}; \node [force, right=1cm of rivalry] (right) {Demand Conditions}; \node [force, below of=rivalry] (bottom) {Related and Supporting industries}; %%%%%%%%%%%%%%%% % Draw the links between forces \path[&lt;-&gt;,thick]  (left) edge (right) (left) edge (top) (left) edge (bottom) (top) edge (right) (bottom) edge (right); \path[&lt;-&gt;,thick]  (bottom) edge (top); \end{tikzpicture} \caption{Porter's Diamond source:~\cite{Porter:1980}}% \label{fig:diamond}  \end{figure} How can I force a line break in the table of contents? Where can I find the restrictions and easements that apply to a given UK Rail Ticket? UK rail ticketing isn't always the simplest thing in the world, but the basics aren't too hard to learn. There are  tickets valid at any time of the day, those available only outside of peak hours (typically after 9 and perhaps not in the evening rush hour), tickets only available at quiet times, tickets valid only on one train. These are mostly, but not always, valid in flavours of single (one way), day return (out and back the same day-ish), and (period) return (out on a given day, back within a month). That's it broadly, but you'll notice there's a bit of variation in even just those...  Next up, there are rules on what sort of route you can take. These largely revolve around , not doubling back, direct trains normally being fine, and not taking too long a route if there's a choice. (There's a whole art to making the most of that though, but this isn't the question for that!)  On top of all that, certain routes and/or stations will have additional restrictions, or easements where default restrictions are lifted. For example, one station might be in an area where the default rule is "off peak tickets valid after 9am", then has an additional restriction "off peak tickets to London only valid on trains arriving after 10am", and an easement "off peak tickets to stations along the insert line name here valid after 08:45".  By looking up these restrictions and easements, it's sometimes possible to save money on your journey. In the example above, you might assume you'd need a peak time ticket to travel on the 08:54 to a station along the local branch line, but the easement actually allows you to travel on a cheaper off-peak ticket instead.  How do you go about looking up what easements apply to a given ticket for a journey, and equally what extra restrictions (eg evening peak times or not-valid-via) apply? PHP Session data not being saved I have one of those "I swear I didn't touch the server" situations. I honestly didn't touch any of the php scripts. The problem I am having is that php data is not being saved across different pages or page refreshes. I know a new session is being created correctly because I can set a session variable (e.g. $_SESSION['foo'] = "foo" and print it back out on the same page just fine. But when I try to use that same variable on another page it is not set! Is there any php functions or information I can use on my hosts server to see what is going on?  Here is an example script that does not work on my hosts' server as of right now:  &lt;?php session_start(); if(isset($_SESSION['views']))     $_SESSION['views'] = $_SESSION['views']+ 1; else     $_SESSION['views'] = 1;  echo "views = ". $_SESSION['views']; echo '&lt;p&gt;&lt;a href="page1.php"&gt;Refresh&lt;/a&gt;&lt;/p&gt;'; ?&gt;   The 'views' variable never gets incremented after doing a page refresh. I'm thinking this is a  problem on their side, but I wanted to make sure I'm not a complete idiot first.  Here is the phpinfo() for my hosts' server (PHP Version 4.4.7): \section*[toc]{normal section title} not working for me Compile gvim from sources? Why does as.factor return a character when used inside apply? For the Pell's equation where $d=2$: $$x^2-2y^2=1$$ What are all the integer solutions to the equation. Apparantly there are infinitely many solutions, but how would I represent them in an expression? Drift velocity in Drude model Ampere's law and external currents In Ampere's law, the current outside the curve taken is not included in the expression. Does it mean that the magnetic field calculated by using the law gives the contribution of only the currents crossing the area bounded by the curve? In the book "Jurassic Park" does the Lysine Contingency actually get explained? I was watching the movie recently and noticed that one of the characters (very) briefly mentions a safety they built into the system should any of the dinosaurs escape. They called it the Lysine Contingency saying that all the dinos have been genetically modified to depend heavily on lysine in their diet, so if any of them escape they wouldn't be able to survive without the food supplements that the park gives them.   Why doesn't the story end right there? Does the Michael Crichton book actually explain this in depth? I recently upgraded Windows 7 to Windows 10. The biggest issue I have now is that the Windows Search service no longer works, making the Start menu mostly unusable.  If I go to Indexing Options in the control panel I see that Indexing is not running and the list of paths to index is empty.  Going to advanced options, the current index path is empty, and the new path is empty too. This is true even if I try to use the "New Index" button.  Using the troubleshooter won't help since the service doesn't start. If I try to manually start the "Windows Search" service, I get the error  "Error 3: Unable to find specified path" (this is the rough translation, the original message is in my language).  What can I do to find out which path/file is missing ? I tried to check with Process Monitor, but the only file (beside system libraries) the SearchIndexer.exe try to access seem to be c:\ProgramData\Microsoft\Search\Data\Application (everytime the service is started the whole folder c:\ProgramData\Microsoft\Search is deleted and recreated) and C:\Windows\System32\config\systemprofile (which exists).  Edit: all available updates are installed, and issuing      SFC /scannow   Doesn't reveal any issue I've always wondered why the number of protons in the Universe exactly matches the number of electrons. They are such different particles with totally different cross sections. So, first of all, is this true? And, secondly, how could it be that they have been produced in the same amount after the Big-Bang? Impose strict time-limit for questions on Hot Network Questions list Installation problem QGIS I do not manage to install QGIS on my windows 10 machine using the osgeo4w installer.  During the installation I get this message:   At the end of the installation I get this message:   And when I subsequently try to run QGIS, I receive this message:    Similar issue can be found in various fora, but none of them provides a conluding answer or did help me to solve the problem.  Any propositions? Heartbleed: are services other than HTTPS affected? The OpenSSL 'heartbleed' vulnerability () affects webservers serving HTTPS. Other services also use OpenSSL. Are these services also vulnerable to heartbleed-like data leakage?  I'm thinking in particular of   sshd secure SMTP, IMAP etc -- dovecot, exim &amp; postfix VPN servers -- openvpn and friends   all of which, on my systems at least, are linked to the OpenSSL libraries. NetGear A6100 AC600 wireless adapter not working in Ubuntu 20.04. Worked fine in 18.04. Not same problem as previously Firstly, I know very well there are answers to this already. But, in my case, it is installed and shows in the terminal as such Bus 001 Device 007: ID 0846:9052 NetGear, Inc. A6100 AC600 DB Wireless Adapter [Realtek RTL8811AU]  It says it is installed in  as well.  I have tried downloading the driver for this adapter from several guides online, linking to GitHub, but no luck there either...  Any help is greatly appreciated! Thanks in advance!  EDIT: The answer from sudo dkms status command reads:  rtl8812au, 4.3.8.12175.20140902+dfsg, 5.4.0-31-generic, x86_64: installed  The other command  modinfo 8812au | grep 9052   spits out the following:  alias:          usb:v0846p9052d*dc*dsc*dp*ic*isc*ip*in* Interscholastic Mathematics League Senior B Division #2