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• Mercury and Sound Waves [Video]

  - by Jason Fitzpatrick

  In this video a tone generator is used to shoot specific frequencies through a large drop of mercury which results in a wide array of unique shapes and patterns created by standing waves–but really, you need to see it to appreciate it. The experiment, put together by Nick Moore, combines a glass dish, a drop of mercury, and a old tone generator to demonstrate standing waves in 3D. Check out the video above to see the experiment in full speed or hit up his YouTube channel to see a remix with music (and other cool science experiment videos). Mercury Hz [via Mental_Floss] How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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• Mounting Samba share whenever it's available, unmounting when it's not

  - by Laurynas Biveinis

  I am trying setup permanent samba share mounts. That's not too hard using these instructions. But, I want them to Automatically remount whenever I join the network where these shares are available. Automatically unmount (or make access requests fail immediately instead of hanging) whenever I leave the network, i.e. avoid this automatically. Googling suggests that AutoFS might be helpful. I gather it takes care of the 1. above but I am not sure about the 2. The other questions about automated Samba mounts, i.e. How to mount a samba share permanently?, do not seem to address automatic remounts/unmounts, so I think this is not a duplicate. Thanks.

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• What does RESTful web applications mean? [closed]

  - by John Cooper

  Possible Duplicate: What is REST (in simple English) What does RESTful web applications mean? A web service is a function that can be accessed by other programs over the web (Http). To clarify a bit, when you create a website in PHP that outputs HTML its target is the browser and by extension the human being reading the page in the browser. A web service is not targeted at humans but rather at other programs. SOAP and REST are two ways of creating WebServices. Correct me if i am wrong? What are other ways i can create a WebService? What does it mean fully RESTful web Application?

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• Will adding q&a help my site's rankings, and if so, what are the implications of a sub-domain for q&a rather than a path on the site? [closed]

  - by ElHaix

  Possible Duplicate: Subdomain versus subdirectory One of our web properties is doing quite well without any additional links being created on the site, and our link inventory is tightly managed - no user-generated links. To introduce a community aspect to the site, we want to implement a q&a forum. Once in place, new links will populate our link inventory with keywords that are not necessarily targeted to the site. With the q&a on a sub-domain, would that not affect the main site's rankings? What's the best approach for this?

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• Not able to create screenshot of when menu is active [closed]

  - by gotqn

  Possible Duplicate: Screenshot of active window doesn’t work I am using Ubuntu 12.04 and I am searching for a program that will let me to do screenshot of my menus too. Also, it will be very useful if I am able to "cut" only part of the new screenshot and save it as a new image. At this moment, when a menu is shown (for example I click on my clock and the calendar is shown) the "print screen" button is not working. This happens to with applications launchers menus in the left navigation panel. On windows I am using Gadwin Pro. Is there any alternative on Linux?

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• How do I get unity back?

  - by Siva

  I got the latest driver software for my old ATI Radeon 4600, and it had me restart. My screen was then just a big terminal! I could log in, but when I typed 'unity' into it as a command, it said something about DISPLAY not found; set it to :0 (zero). I don't know enough about Linux to deal with this. I am using a DSL live CD to ask this. I looked at similar questions suggested, even searched. If my question's a duplicate, I apologise, but I didn't understand what I saw there. T_T

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• Animating shorthand CSS properties with jQuery

  - by Giulio Piancastelli

  Chapter 3 of jQuery Novice to Ninja starts with a section about animating CSS properties, and its first example suggests the following code should expand padding and add a couple of borders to every paragraph in a page: $('document').ready(function() { $('p').animate({ padding: '20px', borderBottom: '3px solid #8f8f8f', borderRight: '3px solid #bfbfbf' }, 2000); }); However, while the code indeed works with the jQuery 1.4 library included in the downloadable examples archive for the book, it only animates padding when used alongside jQuery 1.6, forgetting the shorthand CSS properties for border-bottom and border-right altogether. What happened in the transition between 1.4 and 1.6, causing the removal of this functionality? Has it been placed in some plugin? Is it possible to run this code as it's written and get back the border animation? If not, how would you animate border properties using jQuery 1.6?

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• Techniques for Working Without a Debugger [closed]

  - by ashes999

  Possible Duplicate: How to effectively do manual debugging? Programming in a debugger is ideal. When I say a debugger, I mean something that will allow you to: Pause execution in the middle of some code (like a VM) Inspect variable values Optionally set variable values and call methods Unfortunately, we're not always blessed to work in environments that have debuggers. This can be for reasons such as: Debugger is too too too slow (Flash circa Flash 8) Interpreted language (Ruby, PHP) Scripting language (eg. inside RPG Maker XP) My question is, what is an effective way to debug without a debugger? The old method of "interleave code with print statements" is time-consuming and not sufficient.

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• How to use rel=canonical with Sitecore aliases?

  - by Mike G

  I have inherited a Sitecore architecture that is a mess from an SEO duplicate content POV. There are multiple aliases that have been created (and indexed by the search engines) for many of the 2nd tier pages of the site. Due to server issues, I am not able to 301 redirect these duped pages, so I would like to use the rel=canonical tag in an attempt to try and get Google/Bing to recognize the correct pages I would like to appear in the index. I have blocked the most extraneous duped pages with a robots.txt file, however, since Google/Bing have already spidered many of the duped pages, I need to keep them accessible to the spiders, BUT removed from the index. The catch is, since the duped pages are aliases (and don't really physically exist in Sitecore that I can find), I am not sure how to go about using rel=canonical - or if I even can in this situation..?

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• How to Turn a Match into a Miniature Rocket [Video]

  - by Jason Fitzpatrick

  If you’re looking for a novel little stunt to impress your friends this Fourth of July, these tiny matchstick rockets are a cheap and easy trick to pull out of your sleeve. Courtesy of Grathio Labs, all you’ll need is a book of matches, a pin, a paper clip, and some aluminum foil. Watch the video to see how it all comes together: As always, play safely with the fun-but-potentially-dangerous projects we share. [via Make] How to Use an Xbox 360 Controller On Your Windows PC Download the Official How-To Geek Trivia App for Windows 8 How to Banish Duplicate Photos with VisiPic

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• Alternative to "inheritance versus composition?" [closed]

  - by Frank

  Possible Duplicate: Where does this concept of “favor composition over inheritance” come from? I have colleagues at work who claim that "Inheritance is an anti-pattern" and want to use composition systematically instead, except in (rare, according to them) cases where inheritance is really the best way to go. I want to suggest an alternative where we continue using inheritance, but it is strictly forbidden (enforced by code reviews) to use anything but public members of base classes in derived classes. For a case where we don't need to swap components of a class at runtime (static inheritance), would that be equivalent enough to composition? Or am I forgetting some other important aspect of composition?

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• Calculating Divergent Paths on Subtending Rings

  - by Russ

  I need to calculate two paths from A to B in the following graph, with the constraint that the paths can't share any edges: hmm, okay, can't post images, here's a link. All edges have positive weights; for this example I think we can assume that they're equal. My naive approach is to use Djikstra's algorithm to calculate the first path, shown in the second graph in the above image. Then I remove the edges from the graph and try to calculate the second path, which fails. Is there a variation of Djikstra, Bellman-Ford (or anything else) that will calculate the paths shown in the third diagram above? (Without special knowledge and removal of the subtending link, is what I mean)

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• Best book for learning C++? [closed]

  - by gablin

  Possible Duplicate: Is there a good book to grok C++? I'm lacking a good book for learning C++. Although I'm not an entirely novice, I've learnt C++ mostly by trail-and-error and googling so I don't know all about best practices concerning C++. So what book or books should I get and read? Please only put 1 book per answer, for voting purposes, and maybe a short description of who it's targeted at. Hey, what happened to the community wiki option...?

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• Add Multiple Types of Items to the Desktop Context Menu in Windows 7 or 8

  - by Lori Kaufman

  The context menu in Windows provides a convenient place to start programs, access websites, and open folders. There are several ways to add programs to the menu including a registry method and a free tool. We’ve found another free tool, called Right Click Context Menu Adder, that allows you to add more than just programs to the desktop context menu and the folders context menu. It allows you to add folders, web addresses, and files to the menus, as well as programs. Right Click Context Menu Adder is portable and doesn’t need to be installed. To run it, simply extract the .zip file you downloaded (see the link at the end of this article) and double-click on the .exe file. How to Banish Duplicate Photos with VisiPic How to Make Your Laptop Choose a Wired Connection Instead of Wireless HTG Explains: What Is Two-Factor Authentication and Should I Be Using It?

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• Why do HDFS clusters have only a single NameNode?

  - by grautur

  I'm trying to understand better how Hadoop works, and I'm reading The NameNode is a Single Point of Failure for the HDFS Cluster. HDFS is not currently a High Availability system. When the NameNode goes down, the file system goes offline. There is an optional SecondaryNameNode that can be hosted on a separate machine. It only creates checkpoints of the namespace by merging the edits file into the fsimage file and does not provide any real redundancy. Hadoop 0.21+ has a BackupNameNode that is part of a plan to have an HA name service, but it needs active contributions from the people who want it (i.e. you) to make it Highly Available. from http://wiki.apache.org/hadoop/NameNode So why is the NameNode a single point of failure? What is bad or difficult about having a complete duplicate of the NameNode running as well?

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• How can I backup files on /etc using Deja Dup? [closed]

  - by Chris Good

  Possible Duplicate: How do I open Deja Dup as root? I am using Ubuntu 12.04 LTS. I'm trying to setup Deja Dup to backup the files for several users (/home) and /etc but as it runs as myself, there are many files it cannot read and therefore cannot backup. I want to try running Deja Dup as root as then it should be able to read and backup all files. I've seen some other info about how to set up a particular App to run as root, so I guess I should try that.

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• SQL SERVER – Merge Two Columns into a Single Column

  - by Pinal Dave

  Here is a question which I have received from user yesterday. Hi Pinal, I want to build queries in SQL server that merge two columns of the table If I have two columns like, Column1 | Column2 1                5 2                6 3                7 4                8 I want to output like, Column1 1 2 3 4 5 6 7 8 It is a good question. Here is how we can do achieve the task. I am making the assumption that both the columns have different data and there is no duplicate. USE TempDB GO CREATE TABLE TestTable (Col1 INT, Col2 INT) GO INSERT INTO TestTable (Col1, Col2) SELECT 1, 5 UNION ALL SELECT 2, 6 UNION ALL SELECT 3, 7 UNION ALL SELECT 4, 8 GO SELECT Col1 FROM TestTable UNION SELECT Col2 FROM TestTable GO DROP TABLE TestTable GO Here is the original table. Here is the result table. Reference: Pinal Dave (http://blog.sqlauthority.com)Filed under: PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL

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• Why am I getting "Collection was modified; enumeration operation may not execute" when not modifying

  - by ccornet

  I have two collections of strings: CollectionA is a StringCollection property of an object stored in the system, while CollectionB is a List generated at runtime. CollectionA needs to be updated to match CollectionB if there are any differences. So I devised what I expected to be a simple LINQ method to perform the removal. var strDifferences = CollectionA.Where(foo => !CollectionB.Contains(foo)); foreach (var strVar in strDifferences) { CollectionA.Remove(strVar); } But I am getting a "Collection was modified; enumeration operation may not execute" error on strDifferences... even though it is a separate enumerable from the collection being modified! I originally devised this explicitly to evade this error, as my first implementation would produce it (as I was enumerating across CollectionA and just removing when !CollectionB.Contains(str)). Can anyone shed some insight into why this enumeration is failing?

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• Which forum applications can integrate with Facebook? [closed]

  - by deathlock

  EDIT: I don't think this is a duplicate... I ask for a specific feature, which is Facebook integration. I know this question existed, but I need something more specific than that. That one doesn't outline what I need. What is the best/most compatible forum software which features almost complete integration with Facebook? The main feature I ask is the Facebook Connect feature (user could use Facebook account to register). But it would be more perfect if other Facebook features could be integrated to. Something like, subscribe thread which appears to Facebook notifications, easy sharing to Facebook, etc. I have vBulletin, Invision Power Board, and SMF in my mind, but I'm open to more suggestions..

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• How do I completly remove software? [closed]

  - by Dustin

  Possible Duplicate: Why are the hidden settings-folders not deleted when purging an application? Ok I have 8GB on my desktop dual booting win 7. I installed a few games, assualtcube, tremolous, and spring. But I had removed them using 'remove --purge' and only to find they are still lingering and purge does not well truly purge them. I need them completely gone and not secretly hogging space when I purged them. How can i completely remove software, like it is gone and not going to take any more of my precious space? Shrinking 7 and growing Ubuntu is not an answer I am accepting, i want to know how to completely remove software. Thank you for your time and your answers.

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• Best Resources for learning SQL? [closed]

  - by Simon

  Possible Duplicate: Good Books and videos for absolute beginner to SQL I have landed a role as a product engineer for a web based product. A big part of the product is allowing its users the ability to create queries with SQL to pull in business information from their back end databases. I know the very basics of SQL and need to spend some time getting a better grasp on SQL. I have the tutorial from w3schools on my ToDo list, but was hoping to get some answers that point me to good resources for learning SQL. I have no preference - I can buy a book (SQL For Dummies?), or online resources, online videos, audio, etc.

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• Delete U3 System from SanDisk Cruzer USB Drive [closed]

  - by Petriborg

  Possible Duplicate: How do I get rid of “U3 System” on my USB drive? SanDisk Cruzer come with a "U3" malware built into them. Its intended for windows, but on Ubuntu it shows up as a "U3 System" CD on the desktop and as /dev/scd1 -> sr1 My question - How do I permanently delete this from the device without windows? I'm aware of the windows program, but I don't have access to any, and in any event, I wouldn't want to insert the stick into a windows box because it automatically installs its malware to any windows box comes into contact with! A friend of mine realized you could delete the cdrom via sudo echo "1" > /sys/class/block/srXXX/device/delete But it will come back if you reboot.

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• How are typical users expected to read the documentation in /usr/share/doc?

  - by ændrük

  I only recently learned that there is a huge pile of documentation in /usr/share/doc. How on earth is a typical user supposed to find out about that? It seems like much of it is gzipped, and inaccessible with administrative privileges: $ gunzip examples/letter.tex.gz gzip: examples/letter.tex: Permission denied Are users expected to duplicate each item in their home directory just to read it, or is there a less tedious solution? This arrangement hardly seems conducive to regular browsing. How do normal people read this documentation?

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• How do you know when to change jobs? [closed]

  - by dustyprogrammer

  Possible Duplicate: When do you know it's time to move on from your current job? I have been working for a couple years now. I just want to know what people think about leaving one company for another, or to start looking around for other positions. I tend to use people's resumes as a guideline for when to change from one company to another. I am approaching, the time in my life where most of those people I look too, move away from their first position to pursue others. I know that isn't something good to base my decisions on what other do. I was wondering when is it time to move companies. I am currently happy at my position, and I am learning tons. Its just something I have been seeing a lot, I would like to get a feel for what people think. Thanks.

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• Responsive Menu Navigation [closed]

  - by Aaron Brewer

  I am sure you all have heard of Responsive/Adaptive Website Design and Development, but for the sake of beginners to the technique and skill, what are ways to create a Responsive Menu Navigation? I know there are a few standard ways, hence: JavaScript/jQuery Menu that changes functionality at different breakpoints. CSS3 Menu that changes functionality at different breakpoints. If you have had the opportunity to create a Responsive Menu, what technique did you use? How did you do it? Do you have an example? Did your Menu change functionality at different break points? To read up on Responsive and Adaptive Design: http://johnpolacek.github.com/scrolldeck.js/decks/responsive/ To read up on Responsive and Adaptive Design Menus: http://blog.usabilla.com/10-tips-how-to-handle-responsive-navigation-menus-successfully/ I hope this will save Pro Webmasters plenty of duplicate questions.

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