The Harry Potter series discusses many spells created by particular wizards like Snape and Voldemort. What does it really mean to create a spell?   Does the creator select a befitting Latin phrase and certain wand movements to channel the magic inherent in him? More importantly, how does he/she seal these for use by all future wizards?  The first may be all right, since it seems suggested in the series that, in principle (i.e., with sufficient ability, expertise in channelling magic etc.), any spell could work non-verbal and wandless. It is the second subquestion above that demands an answer.  After all, every spell discussed had to be created at some point in the past, since Latin had a beginning in history.
In the Harry Potter series, are wizards capable of creating their own spells, or are they limited to the spells that they're taught/learn?  I seem to remember something about Snape creating sectumsempra, but I'm not sure if that really is the case.
Best practices for storing UI settings? we're currently planning a larger WPF LoB application and i wonder what others think being the best practice for storing lots of UI settings e.g.   Expander States Menu orders Sizing Properties etc...   i don't like the idea of having dozens of stored values using the delivered SettingsProvider (i.e. App.config file) although it can be used to store it in an embedded database using a custom SettingsProvider. being able to use some kind of databinding is also a concern. Has anyone had the same problems?   What did you do to store lots of ui user settings? How to fix lsregister failing associations after reboot? Virtualbox: OS cannot use the new extended disk space (.vdi) I am running Virtualbox. I increased the size of my hard disk (.vdi) from 10G to 15G. Now when I start my Mint vm, the hard disk reports as 7.5g (df) even though i extended it (fdisk -l). I am not sure what is the problem. Can anyone point me the problem?  $ df -h Filesystem      Size  Used Avail Use% Mounted on /dev/sda1     &gt;&gt;7.5G&lt;&lt; 7.1G   61M 100% / udev            1.5G  4.0K  1.5G   1% /dev tmpfs           581M  888K  581M   1% /run none            5.0M     0  5.0M   0% /run/lock none            1.5G   88K  1.5G   1% /run/shm  $ sudo fdisk -l Disk /dev/sda: &gt;&gt;16.1 GB&lt;&lt;, 16106127360 bytes 255 heads, 63 sectors/track, 1958 cylinders, total 31457280 sectors Units = sectors of 1 * 512 = 512 bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x000c55a4     Device Boot      Start         End      Blocks   Id  System /dev/sda1   *        2048    15728639     7863296   83  Linux /dev/sda2        15730686    16775167      522241    5  Extended /dev/sda5        15730688    16775167      522240   82  Linux swap / Solaris  $ vboxmanage showhdinfo mint.vdi UUID:                 a94931b9-673c-440a-ab6b-2c3eedd0cf93 Accessible:           yes Logical size:         15360 MBytes Current size on disk: 7806 MBytes Type:                 normal (base) Storage format:       VDI Format variant:       dynamic default Location:             /opt/virtualization/vm/mint.vdi How to show $u \in R^{x} \implies u \in R[X]^{x}$ for integral domain $(R,+, \times)$ I did an upgrade today to the latest version of ubuntu. Everything looked good and fine only for me to discover that I cannot find my applications after clicking the 'Show Applications' icon. The same applies when I search for an application in the search bar, I do not see it. It shows me an endless search.  These are the screenshot images of the problem:      In the meantime, I access my applications from the menu at the top bar and also use the terminal to run applications with CLI. I would like to be able to set a flag at the beginning of the main flag (say output) that tells if I want to produce a paper document or an electronic document.   Then I should check this flag to define or not empty pages, hypperref, oneside or twosides, etc.  How could I do that ? Moving from HTTP to HTTPS in Google Search Console I'm moving from HTTP to HTTPS for my entire site. The site is currently added to Google Search Console (formerly Google Webmaster Tools) as www.example.com and all the pages are indexed without using SSL.  How do I go about moving to the new HTTPS URLs on Google Search Console?   Do I just submit an updated sitemap which has the HTTPS URLs or do I add a new site as https://www.example.com and submit the sitemap with HTTPS URLs? All current URLs are set to redirect to their HTTPS counterparts. Do I add multiple properties to Google Search Console? How can I print the table of contents multiple times in my document? It is common for public Wi-Fi access points to include login pages, even at times, when they’re free (i.e. Starbucks, many airports, hotels, etc).  I’m often in a situation where I’ll open up Chrome/Firefox, with and all my previously open tabs will start to reload.  If there is a wireless login redirection page, however, every tab is redirected and reloaded and the previous page is lost from history (and the back button won't return to it).  Is there any way to avoid or circumvent this behavior? Let $L,M$ two subspaces of the vector space, $V$ such that both $L,M \ne V$.   Prove: $L\cup M \ne V$.     I think this is a case of a proof by contradiction. Lets assume $L \cup M = V$.   Hence, $$\dim(V) = \dim(L) + \dim(M) - \dim(L\cap M)$$  How to proceed? There is a hint to show that if there were points in $\mathbb{Q}$, then there would exist $r,s, t \in \mathbb{Z}$ with $\gcd(r, t) = 1$ such that $2s^2 = t^4 - 17r^4$ , and then show that any prime dividing $s$ is a quadratic residue modulo $17$.  I'm stuck on the first bit - if you suppose $\left(\frac{a}{b}, \frac{c}{d}\right)$ is a point on the curve in $\mathbb{Q}$ (so $a, b, c, d \in \mathbb{Z}$) then you get to $2a^2d^4 = b^2c^4 - 17b^2d^4$, but I'm not sure where to go from here since you don't know that $b$ is a square? JavaScript open in a new window, not tab I have a select box that calls window.open(url) when an item is selected.  Firefox will open the page in a new tab by default.  However, I would like the page to open in a new window, not a new tab.    How can I accomplish this? Let me filter jobs by the employer's Joel Test Scores In SF1, Stop refreshing the embedded vf page on a layout Below is my VF page which is embedded on a layout. In SF1 mobile app, it's getting refreshed whenever we touch on it. How can I avoid refreshing the VF page while touching it on the screen? In Desktop it's working fine. Please provide your inputs. &lt;apex:page standardController=&quot;PremiseObj__c&quot; lightningStylesheets=&quot;true&quot;&gt; &lt;apex:includeLightning /&gt; &lt;apex:slds /&gt; &lt;div id=&quot;premiseServDetails&quot;&gt; &lt;/div&gt; &lt;script&gt; window.onload = function (){     $Lightning.use(&quot;c:PremiseObjUpdateApp&quot;, function() {         $Lightning.createComponent(&quot;c:PremiseObjUpdatecmp&quot;,                                    {                                         recordId : &quot;{!Premiserecord__c.Id}&quot;                                     },                                    &quot;premiseServDetails&quot;,                                    function(cmp,event) {                                        setTimeout(function() {                                            //document.getElementById('loading').style.display = 'none';                                        }, 3000);                                    });     }); } &lt;/script&gt; &lt;/apex:page&gt; How do they decide Blu-ray/DVD release date? I think my question is different from .  Some movies' productions release Blu-ray/DVD so early after theatrical release, others will take time. How do they decide for the Blu-ray/DVD release date? Where are minecraft languages stored and how can I add a new one? Flag dialogs for grayed-out posts are also grayed-out What is the meaning of “runneth”? What is the meaning of “runneth” in ? better Curve/Text to Mesh generation? You are here, but where's here? I find the .youarehere a styling for the main navigation links causes the text to be a little difficult to read on the also-blue header background. Could we give it a little bit of background colour or something else that would provide more contrast?  For example:    which is the product of the following CSS*:  .nav ul li {     margin: -2px 10px 0 0;     padding: 5px; }  .nav ul li.youarehere {     background-color: rgba(0, 80, 112, 0.25);     border-radius: 5px; }  .nav ul li.youarehere a {     color: #A1E9FF; }   *For bonus points, also reduce the line height for the codeblocks!