How can I use the same material at another slot and change it independently?
How can I make a copy of a material?
Why Cooper or Dr. Brand can't send message? What are the guidelines for using version-specific tags? I believe that some of my questions were asked before but I didn't find any satisfying guidance. I just found only . I hope senior members will help me to understand the situation and use tags correctly.  I have several questions which are related to following explanation:   What is current community's attitude towards version specific tags on Stack Exchange?  How to correctly use version specific tags?  When is it good to create version specific tag? Should any version specific tags be at least marked as synonyms to version unspecific tags? Should I use version specific tags if I re-tagging questions?  Should I re-tag questions if I think that incorrect version specific tag is used?   For example, I mainly visiting questions related to two main topics: WCF and Entity framework. Tagging questions in these topics follow very different rules. WCF uses single main tag  sometimes combined with  currently proposed as synonym to WCF, whereas Entity framework currently have:      - version 2 and 3 never existed  - I started this tag myself but now I think it was a mistake   and two ridiculous tags (both for CTP5 of EF 4.1 – their meaningful lifetime was about 3 months):         I've already several times retagged questions introducing tag for EF 4.1 RC. Separate problem is in Code-first approach related strictly to  where 5 other tags are used to describe the same:           I asked for merging these tags in .  As you can see that EF topic currently contains too many tags to describe the same. There are other related tags to EF but they are mainly used as supporting tags for specific features.  First I thought this is a common situation because ASP.NET MVC uses also new tag for each version even questions usually asks for general problems related to any version but then I was informed by @Richard in  that EF is probably tag polluted.  I regularly retag questions in EF topic. Currently I'm using:     as general topic's tag because I was already informed by @Slauma  that people usually have only this tag between their favorites and I should not remove it. It was a good point.   for questions related directly to EFv4 features  for questions related directly to EF 4.1 features  for questions related to fluent and annotations mapping from EF 4.1   But still I think that  and  are somehow redundant but I'm not sure if my opinion is shared by other participants in these tags. WCF also has 3 versions and almost twice as more questions than EF and it still uses only single main tag  without any problem. I think the used version should be information included in a question.  Are there any general rules? What about version related tags to C#, .NET and ASP.NET MVC? I first thought that it is common and accepted approach to create version specific tags just because users around ASP.NET MVC (strong tag) do the same.  Sometimes I think I received privileges too early and I don't use them correctly. I need some guidance. Can any one explain me what is the use of derivatives in real life. When and where we use derivative, i know it can be used to find rate of change but why?. My logic was in  real life most of the things we do are not linear functions and derivatives helps to make a real life functions into linear.  eg converting parabola into a linear function $x^{2}\rightarrow 2x$  but then i find this; derivation of $\sin{x}\rightarrow \cos{x}$  why we cant use $\sin{x}$ itself to solve the equation. whats the purpose of using its derivative $\cos{x}$. Please forgive me if i have asked a stupid questions, i want to improve my fundamentals in calculus. Google search results showing up a URL on its search which doesn't exist on the website I am using a keyword to display a website page on google search. After entering the keyword, on the first page of google, I am redirected to a page, whose domain is exactly similar to the website whose page I want to display, but it is showing a page which doesn't even exist on the domain. Also, as similar domain with spam characteristics is also getting displayed.   To practically demonstrate this issue, do follow the below steps.   Go to  Type dolce streichquartett and click on search. The 4th/5th URL has this link http://www.dolce-streichquartett.de/?high_ry=/casinos/de/spielautomaten-casino-bregenz.php, which is no where on the website and looks like spam The 7th/8th link you see is http://deonlinecasino.org/doc/kostenlos-roulette-spielen-spielgeld-ausdrucken.php, which is exactly similar to the above with the title as the keyword but a different domain.   What is this issue and why is this happening? Cannot Select Linked When Sync Selection Is Enabled Why does the image not appear? How can I make the map::find operation case insensitive? Convergence of $\int_0^\infty $sin$ (x^p) dx$ Thats my . I loaded this to PostgreSQL DB using PostGIS shape file loader. I ran pgr_anlayzeGraph() on it and found it had a lot of isolated segments.  Next I ran pgr_nodeNetwork() to create a new table 'ways_ways'. I made the topology  for it and ran the following query in Qgis sql window.   SELECT * FROM ways_ways JOIN (SELECT seq, id1 AS node, id2 AS edge, cost FROM  pgr_astar('SELECT id, source, target, cost, x1, y1, x2, y2 FROM ways_ways',  1, 108, false, false) )AS route ON ways_ways.id = route.node;   Given below are the screenshots: Original floorplan and the prescribed route  query ouput   Clearly , I don't have a continuous output. I ran pgr_analyseGraph on ways_ways to find that it has no more isolated segments . It has 51 deadends, which is acceptable.   Did I miss any step in pgrouting? Is there anyway to see which node has id 1 and id 108 in qgis?  i ran the same query in another map(which i downloaded) and got output for all possible source and target ids. So how can i create a way(a route) that is completely noded? Why does node not evaluate Math.tan(Math.PI/2) to Infinity but Chrome V8 does? How to format an inline source code Iteration over std::vector: unsigned vs signed index variable What is the correct way of iterating over a vector in C++?  Consider these two code fragments, this one works fine:  for (unsigned i=0; i &lt; polygon.size(); i++) {     sum += polygon[i]; }   and this one:  for (int i=0; i &lt; polygon.size(); i++) {     sum += polygon[i]; }   which generates warning: comparison between signed and unsigned integer expressions.  I'm new in the world of C++, so the unsigned variable looks a bit frightening to me and I know unsigned variables can be dangerous if not used correctly, so - is this correct? How do I easily switch between windows rather than applications in GNOME Shell? "Stack Overflow requires external JavaScript from another domain" message is error 404  Well, it seems that Wget picks it up so the last statement is false and the exact message is:  Error 6 (net::ERR_FILE_NOT_FOUND): The file or directory could not be found.   and it loads in Chrome once after I clear the cache but not after. Alignment issue in Area 51 main site - site switcher, inbox and achievements How to call gdal_translate from Python code? Is it possible to use some gdal API to call gdal_translate from Python code? I do not mean simply executing the gdal_translate.exe from the file system, but rather call it somehow in code so I do not need to know the exact directory the gdal_translate executable is in? I'm currently typing a mathematical document which counts many sum symbols. I frequently use the align environment to render equations, although the default behaviour of this environment is to render the equations in displaystyle, which in my opinion wastes vertical space. I therefore have added \textstyle at the beginning of each line of math in this environment, but I'm looking for a more convenient solution.   So is there an environment that is similar to align with the exception it displays textstyle math by default ? Thank you. Ever since mods gained the ability to undelete comments, deleting them has become easier as the confirmation dialog was removed.  However, this is not the case in the mod queue &mdash; I still get a confirmation dialog for each comment I want to delete in the queue under a custom-flagged post (single-comment flags can be deleted just fine). And since this is the place from where I delete comments the most, it can be annoying.  In addition, the "purge comments" button, when invoked from the queue, refreshes it, so I have to scroll back down, remember which post I just purged, and mark the flag as helpful. Usually not a big issue but if there are multiple "obsolete comments" flags, then it can get confusing.  Could the workflow for comment thread moderation from within the queue be improved? Ideally, make comment deletion work like everywhere else on the site, and make the purge button AJAX-based like the comment deletes. Consider:  List&lt;String&gt; someList = new ArrayList&lt;String&gt;(); // add "monkey", "donkey", "skeleton key" to someList     for (String item : someList) {     System.out.println(item); }   What would the equivalent for loop look like without using the for each syntax? In bash, how do I escape an exclamation mark? I want to do something like bzr commit -m "It works!". I can sort of escape the exclamation mark by doing bzr commit -m "It works\!". However, then my commit message includes the backslash. How do I escape the exclamation mark, while still ignoring the backslash?