How to re-install ubuntu that is pre-installed by manufacturer
How do I pre-install Ubuntu for someone (OEM install)?
Why are objects at rest in motion through spacetime at the speed of light? I read that an object at rest has such a stupendous amount of energy, $E=mc^2$ because it's effectively in motion through space-time at the speed of light and it's traveling through the time dimension of space-time at 1 second per second as time goes forward.  What troubles me here, is the fact that it is traveling through space-time at the speed of light. Why is it at the speed of light? Ambiguity of the word 'any'? Anchor Text code string is automatically modified by WordPress I have created an ad for a merchant wanting to rent ad space on my website home page. After creating the ad, (anchor text and pic/graphics with embedded hyperlink) the merchant has requested I remove my url from the ad code. The anchor text along with the embedded hyperlinks links to the merchant's home page.  Problem is I don't know how my url was added to the code as I never inputted it in the original code in the first place. Somehow it was added by I think, WordPress or my server (PHP).  When I view the page source I do see my url was added to the ad code.  Can anyone help explain this and tell me how I can remove the url? Also, if I am able later to remove my url, how will it affect the hyperlink and anchor text?  Thank you, -Dan  Hi s_ha_dum,  I have read your answer and have now made sure the code reads as abosolute url.  Here it is with absolute url:  &lt;strong&gt;If you are interested in helping others treat and prevent hypertension, consider a healthcare degree from &lt;a href="http://elearning.loyno.edu/"&gt;Loyola Online Courses today!&lt;/a&gt;&lt;/strong&gt;   It still shows in page source however with my url addended to the code string.  What am I not understanding? Thank you! Derivation of the general forms of partial fractions header and footer of the first page of every chapter It maby be weird, I want to make header and footer for every page including the first page of each chapter, how can I do this? What's the best way to scan in hundreds of pictures? I have thousands of old pictures which were sitting in a photo album. Unfortunately, instead of the photo album protecting the pictures, the plastic coverings yellowed, and the pictures themselves had to be carefully extracted from the books. There is also quite a bit of powdered paper (the backings on the books pretty much fell apart while we extracted the pictures), and the fronts of the images are still a bit sticky.  These pictures are 30+ years old, are often extremely faded, and were originally taken on (what I think is) "110 film" -- they are approximately 2.5" squares.  Anyway, I need to scan all these images in to preserve them from further decay. Unfortunately, it's taking forever -- going through less than 100 images took an entire day, even if one discounts any time spent in Photoshop trying to remove some of the photo album's artifacts on the images.  What I really need is some method of scanning the images in faster. Most automated solutions aren't going to work because they accept 4x6s as their smallest image size, and even if that was not the case, the adhesives still stuck to the prints would probably ruin any such device in 5 seconds flat.  Is there a better way of doing this (i.e. fast scanner?) that wouldn't take so much time? INT(5) vs SMALLINT(5): numbers in parenthesis after the numeric type In MySQL table definitions is there a different between INT(5) and SMALLINT(5)?  Or do they both represent the same size? Execution of AfterInsert caused by: System.StringException: Invalid id: () - where have I gone wrong? We've had a community deployment and my brain is fried and I just whipped up a quick class that is throwing the below error. What have I done wrong here?     Error: CANNOT_INSERT_UPDATE_ACTIVATE_ENTITY, MSI_UserTrigger:   execution of AfterInsert caused by: System.StringException: Invalid   id: () : [] () : []: ()   What I am trying to accomplish is:   When a new user is created and is active, if they are linked to a ContactId and part of a specific profile (by name), add their ContactId to a Set&lt;ID> Then loop through contacts where the Id is in the set, and update the Community_User__c field to TRUE      Trigger:   trigger MSI_UserTrigger on User (after insert) {       if(Trigger.isAfter){          if(Trigger.isInsert){              MSIUserTriggerHandler.executeAfterInsert(Trigger.new);          }      } }      Class:   public with sharing class MSIUserTriggerHandler {     private static final String COMMUNITY_PROFILE = 'Community Knowledge User';     private MSIUserTriggerHandler() {}      public static void executeAfterInsert(List&lt;User&gt; newList){         setCreatedCommunityUsers(newList);     }      private static void setCreatedCommunityUsers(List&lt;User&gt; newList){         List&lt;User&gt; usersWithContacts = new List&lt;User&gt;();         List&lt;Contact&gt; contactsToUpdate = new List&lt;Contact&gt;();         Set&lt;ID&gt; contactIds = new Set&lt;ID&gt;();          for(User u: newList){             if(u.ContactId == null &amp;&amp; u.ContactId == ''){                 continue;             }             if((u.ContactId != null &amp;&amp; u.ContactId != '') &amp;&amp; u.Profile.Name == COMMUNITY_PROFILE &amp;&amp; u.isActive == true){                 contactIds.add(u.ContactId);             }         }          for(Contact c : [Select Id,Name,Community_User_Created__c from Contact where Id in :contactIds]){             if(!c.Community_User_Created__c){                 c.Community_User_Created__c = true;                 contactsToUpdate.add(c);             }         }         update contactsToUpdate;     } }   Am I not adding the ID correctly to the Set&lt;ID>, or am I querying wrong in my for(Contacts) loop? A PCI Express 3.0 Video Card into a PCI-E 1.0 x16 slot Perhaps I'm trying to push my mobo too hard, but I think I have read that PCI-e 3.0 is back compatible to previous PCI-e specifications. But 3.0 into a 1.0, is it possibly asking too much?  I'm thinking about buying an AMD . My mobo is an Asus p5g41-m le Is there a way to arrange windows within the same application in the taskbar of Windows 7?  Right now we can freely adjust each application's position in the taskbar, but within the app itself the windows can't be reordered, for example multiple windows of firefox or chrome. I'm unable to update nodejs, and I can't see why.  If I were to make a guess, I'd say that I have two repositories listed in apt-get, that both contain a nodejs package.  Here's what I've done:  Remove old version:  sudo apt-get remove --purge nodejs npm   Then, going by , I've run:  curl -sL https://deb.nodesource.com/setup_5.x | sudo -E bash -   And then:  sudo apt-get install -y nodejs   I then run:  nodejs -v   Which returns:  v0.10.25   Can anyone explain what's going wrong? And how I can remedy this situation?  Many thanks. How to tell if a  tag failed to load I'm dynamically adding &lt;script&gt; tags to a page's &lt;head&gt;, and I'd like to be able to tell whether the loading failed in some way -- a 404, a script error in the loaded script, whatever.  In Firefox, this works:  var script_tag = document.createElement('script'); script_tag.setAttribute('type', 'text/javascript'); script_tag.setAttribute('src', 'http://fail.org/nonexistant.js'); script_tag.onerror = function() { alert("Loading failed!"); } document.getElementsByTagName('head')[0].appendChild(script_tag);   However, this doesn't work in IE or Safari.  Does anyone know of a way to make this work in browsers other than Firefox?  (I don't think a solution that requires placing special code within the .js files is a good one. It's inelegant and inflexible.) Eclipse is not starting on Windows 7 Change rep required to downvote on MSE To make your opinion known on MSE you need both up and downvotes. Given at the moment you need 125 rep to downvote on this site, the voting patterns will be skewed positive because not everyone is active on the site.   This is to be expected for regular Stack Exchange sites as you are expected to be involved in the community before you are deemed knowledgeable enough to be part of the community voice. However, MSE is different because you are voting for the entirety of the Stack Exchange network and you shouldn't need to be active on MSE itself to have a voice on changes to the entire network.  This is especially important for questions like  because it will effect every network to do with coding at all. This was brought up in .  I would suggest reducing the rep required to downvote on MSE down to 100 (or 101) rep. This is the amount you get for the site association bonus. This is given once you achieve 200 rep on any network site and shows that you are active in at least one community. I think this would be the perfect use of the association bonus in showing that you are a member of the Stack Exchange community. Batch renaming files I have a directory full of images:  image0001.png image0002.png image0003.png ...   And I would like a one-liner to rename them to (say).  0001.png 0002.png 0003.png ...   How do I do this? Where are the review queue counters? The review queue counters have disappeared:        Where are they?  When I did screenshot the Close Votes queue was not empty, if someone think so. Grant Select on all Tables Owned By Specific User How to find normal and lognormal moments, given partial information? $Y=\ln(X)$. $X$ is lognormal and $Y$ is normal. If all I know is the arithmetic mean of $Y$ and the standard deviation of $X$. What is the formula to calculate the arithmetic mean of $X$ and the standard deviation of $Y$? Why do we need sigma-algebras to define probability spaces? We have a random experiment with different outcomes forming the sample space $\Omega,$ on which we look with interest at certain patterns, called events $\mathscr{F}.$ Sigma-algebras (or sigma-fields) are made up of events to which a probability measure $\mathbb{P}$ can be assigned. Certain properties are fulfilled, including the inclusion of the null set $\varnothing$ and the entire sample space, and an algebra that describes unions and intersections with Venn diagrams.  Probability is defined as a function between the $\sigma$-algebra and the interval $[0,1]$.  Altogether, the triple $(\Omega, \mathscr{F}, \mathbb{P})$ forms a probability space.  Could someone explain in plain English why the probability edifice would collapse if we didn't have a $\sigma$-algebra? They are just wedged in the middle with that impossibly calligraphic "F". I trust they are necessary; I see that an event is different from an outcome, but what would go awry without a $\sigma$-algebras?     The question is: In what type of probability problems the definition of a probability space including a $\sigma$-algebra becomes a necessity?       provides a plain English accessible explanation. The idea is a spinning pointer rotating counterclockwise on a circle of unit perimeter:       We begin by constructing a spinner, which consists of a circle of unit   circumference and a pointer as shown in [the] Figure. We pick a point   on the circle and label it $0$, and then label every other point on the   circle with the distance, say $x$, from $0$ to that point, measured   counterclockwise. The  experiment  consists  of spinning the pointer and    recording the label of the point at the tip of the pointer. We let the random   variable $X$ denote the value of this outcome.  The sample space is   clearly the interval $[0,1)$.  We would like to construct a   probability model in which each outcome is equally likely to occur. If   we proceed as we did [...] for experiments with a finite number of   possible outcomes,  then we must assign the probability $0$ to each   outcome,  since otherwise,  the  sum  of  the  probabilities,  over    all  of  the  possible  outcomes,  would not equal 1.  (In fact,   summing an uncountable number of real numbers is a tricky business;    in  particular,  in  order  for  such  a  sum  to  have  any  meaning,   at  most countably many of the summands can be different than $0$.)    However, if all of the assigned probabilities are $0$, then the sum is   $0$, not $1$, as it should be.   So if we assigned to each point any probability, and given that there is an (uncountably) infinity number of points, their sum would add up to $&gt; 1$. Displaying two XML listings side by side. I have two XML outputs from a program that I would like to include in a LaTeX document. I would like them to appear side-by-side each in its own box. So that a reader can compare the two outputs while reading the document. Can't seem to find a way to do this, without making images for each output and adding both as images/graphics. Could there be a better option?