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Will factory resetting my device remove the Android upgrade? I have upgraded my phone to Android 2.1. I need to reset my phone but I don't want to lose the upgrade. Is it possible to do this? How? Does Sheldon Cooper have Asperger's Syndrome? Documents required by Indian citizens wishing to travel to Nepal I'm a citizen of India and I'm travelling to Nepal by air. Is an Aadhaar Card a valid document used for travelling to Nepal by air? Only squares instead of letters and numbers are displayed in my calculator and other apps in Ubuntu 18.04 How to revert to GNOME Classic Desktop? I'm used to GNOME Classic and personally don't want to change to anything else, but it seems there is no more GNOME Classic in the Oneiric release. After apt-get installed gnome-session and all, though there comes back the GNOME Classic option in the session listbox, however, after logged in, it seems not the expected one.  There is no System menu in the top bar, and I couldn't customize panels at all. I want to change the appearance(theme), but I can't find Appearance menu at all. And much more differences to my previous experience of GNOME classic shell.    There are multiple valid answers for this question spanning over several versions of Ubuntu. For your convenience an index of each below:    and up      &amp; NSDictionary with ordered keys I have an NSDictionary (stored in a plist) that I'm basically using as an associative array (strings as keys and values).  I want to use the array of keys as part of my application, but I'd like them to be in a specific order (not really an order that I can write an algorithm to sort them into).  I could always store a separate array of the keys, but that seems kind of kludgey because I'd always have to update the keys of the dictionary as well as the values of the array, and make sure they always correspond.  Currently I just use [myDictionary allKeys], but obviously this returns them in an arbitrary, non-guaranteed order.  Is there a data structure in Objective-C that I'm missing?  Does anyone have any suggestions on how to more elegantly do this? Getting code onto a microcontroller I have broken open a few circuits of some electronics (DVD player, handheld game device) and I can see the microcontrollers in them. However, I have no idea how they get their programs onto them! There is no micro usb or usb plug anywhere on them! How would they have gotten their program onto there? Allow [tag:tag-name] syntax to link to any site There are now errors when updating and I cannot install most software due to a corrupted  /etc/apt/sources.list   file. Is there a copy I can download to replace it?  The file would be for Ubuntu 12.04 (Final Beta) in the United States. Can there be two distinct, continuous functions that are equal at all rationals? Akhil showed that the  is the same as the continuum, using as a step the observation that continuous functions that agree at rational points must agree everywhere, since the rationals are dense in the reals.  This isn't an obvious step, so why is it true? How can one refute John Searle's "syntax is not semantics" argument against strong AI? Send authors an inbox message if their question is closed I think it would really help if you get notified that a question of yours was closed.  Especially for the multi-site power user, usually (at least for me) a question is asked and then left alone for while. I rely on the network-wide inbox to tell me when someone has commented or answered, but if I don't receive any messages then I tend to assume that the question wasn't answered or even noticed. It's only when I check the question a day or two later to see what I can add do I find out it was closed.  This would be especially helpful for duplicates, where the answers you need are already there. A message to the effect of, "Closed as duplicate of question" is just like notifying me that a new answer has been added!  Unfortunately, question closures can remain unnoticed by their askers until months have passed. By then, the questions may either be too old to migrate to the correct site, or may , depending on the specific closing reason. We should notify users of these question closures so that they can improve them and learn from their mistakes.  Could closed questions get added to the inbox? Is there a software utility to adjust screen gamma/brightness/contrast? Cryptoclass Throws Error. Invalid private key. Must be 16 bytes. Sending 16 characters long key key__c :- abcdefghijklmnop  public static String decrypt(String data) {     EncryptionSettings__c settings = EncryptionSettings__c.getOrgDefaults();     if (settings.key__c == null) {         throw new FacebookException('Cannot decrypt without a key!');     }     Blob key = EncodingUtil.base64Decode(settings.key__c);     return Crypto.decryptWithManagedIV('AES128', key, EncodingUtil.base64Decode(data)).toString(); }  public static String encrypt(String data) {         EncryptionSettings__c settings = EncryptionSettings__c.getOrgDefaults();     Blob key = null;     if (settings.key__c == null) {         checkUserCanCustomizeApplication();         key = Crypto.generateAesKey(128);         settings.key__c = EncodingUtil.base64Encode(key);         insert settings;     } else {         key = EncodingUtil.base64Decode(settings.key__c);     }     return EncodingUtil.base64Encode(Crypto.encryptWithManagedIV('AES128', key, Blob.valueOf(data))); } 'Good' review audits can be misleading Gdata signed request error: "Unknown authorization header" How can PPAs be removed? how can I extrude curve shapes onto curve without tapering I'm stuck. Can't figure out how I can extrude a closed curve onto a NURBS curve without it looking tapered.   I notice that when it's set to "2D" there is no tapering, but I want to do it on 3d.  Thanks for help. Given the following components  DECLARE @D DATE = '2013-10-13' DECLARE @T TIME(7) = '23:59:59.9999999'   What is the best way of combining them to produce a DATETIME2(7) result with value '2013-10-13 23:59:59.9999999'?  Some things which don't work are listed below.    SELECT @D + @T       Operand data type date is invalid for add operator.     SELECT CAST(@D AS DATETIME2(7)) + @T       Operand data type datetime2 is invalid for add operator.     SELECT DATEADD(NANOSECOND,DATEDIFF(NANOSECOND,CAST('00:00:00.0000000' AS TIME),@T),@D)      The datediff function resulted in an overflow. The number of dateparts   separating two date/time instances is too large. Try to use datediff   with a less precise datepart.   * The overflow can be avoided in Azure SQL Database and SQL Server 2016, using .    SELECT CAST(@D AS DATETIME) + @T       The data types datetime and time are incompatible in the add operator.     SELECT CAST(@D AS DATETIME) + CAST(@T AS DATETIME)      Returns a result but loses precision 2013-10-13 23:59:59.997 Why is the derivative of a circle's area its perimeter (and similarly for spheres)? When differentiated with respect to $r$, the derivative of $\pi r^2$ is $2 \pi r$, which is the circumference of a circle.  Similarly, when the formula for a sphere's volume $\frac{4}{3} \pi r^3$ is differentiated with respect to $r$, we get $4 \pi r^2$.  Is this just a coincidence, or is there some deep explanation for why we should expect this?