I was not able to find a way to create a built-in Guest user account under Windows 10 using their new Control Panel, so I resorted to adding it manually via the Computer Management snap-in:    After which it started appearing in the User switcher:    But if I click it to switch to it, Windows kicks me out into the login screen:    and nothing happens. (Note that the Guest account is no longer shown here.)  I also checked the event log and the only record it has about this event is under Local -> Windows Logs -> Application:     The winlogon notification subscriber  was unavailable to   handle a notification event.   So what am I doing wrong?
In older versions of Windows and even in Windows 10 previews you could enable the built-in guest account in control panel     Control Panel\User Accounts\User Accounts\Manage Accounts     In Windows 10, the Guest entry is missing.  Using Computer Management or net user you can still enable the guest account, but even then it doesn't show up on the logon screen.  In the Local Security Policy secpol.msc:     Local Policies - User Rights Assignment - Deny log on locally   we can see guest listed, this wasn't the case in older versions of Windows.  After removing guest from that policy, it is listed on the logon screen and we can using it to log on.  However, the whole Explorer shell is crashing and restarting constantly. The desktop is blinking and you can't click anything.  So the guest account is totally broken.   There is a  about this showing that some code was quickly added to the control panel to not show the guest account. So Microsoft does know about the problem.  While I don't really expect anybody to know what they've done to break this, at least this explains why the guest account is currently not listed.
Proof of $\gcd(a,b)=ax+by\ $ [Bezout's identity] dd aplied to dev USB before connect corrupt /dev/sdX and dont work I have a USB where I'm coping an ISO of 5 Mb aprox with a small OS with its own grub. If I connect the device and check it sudo fdisk -l I get:  ... Device     Boot Start   End Sectors  Size Id Type /dev/sdb1  *        1  9551    9551  4.7M cd unknown   If I copy with dd the ISO sudo dd if=my_os.iso of=/dev/sdb   14852+0 records in 14852+0 records out 7604224 bytes (7.6 MB) copied, 0.538487 s, 14.1 MB/s   It works perfectly. An boot from BIOS in other PC.  The problem is, sometime I forget to connect the USB after update the BIOS, so I do ff WITHOUT the USB connected,  the output is:  14852+0 records in 14852+0 records out 7604224 bytes (7.6 MB) copied, 0.00987684 s, 770 MB/s   Now, the /dev/sdb register is corrupted, the copy speed (770 MB/s) have no sense, and cannot user again dd until reboot.  I have tried to repair it with ddrescue and it doesn't work  sudo ddrescue /dev/zero /dev/sdb conv=noerror,sync   My question is, what is happening exactly and if is possible, how to repair /dev/sdb to avoid reboot and dd start working again?  Thanks. Why don't we have a theory of everything? What is currently stopping us from having a theory of everything? i.e. what mathematical barriers, or others, are stopping us from unifying GR and QM? I have read that string theory is a means to unify both, so in this case, is it a lack of evidence stopping us, but is the theory mathematically sound? What are LiDAR returns? Can someone help with an explanation and some references, in order to understand the nature of return pulses within a LiDAR system. I was confused, trying to copy some files from one PC to another. I have it figured out, but the syntax is still confusing to me. This works:  scp ~/Desktop/Volenteer.png jay@server.ip:~j0h/b   which puts Volenteer.png in the folder /home/j0h/b.  However, this doesn't work:  scp ~Desktop/Volenteer.png     jay@server.ip:~j0h/b   This also fails, giving an exit status 1 file not found:  scp ~/Desktop/Volenteer.png     jay@server.ip:~/j0h/b   As does this:  scp ~Desktop/Volenteer.png     jay@server.ip:~j0h/b   So clearly, there is some difference between ~ and ~/ That difference is the presence of /   $~/ bash: /home/j0h/: Is a directory $ ~ bash: /home/j0h: Is a directory   So why in scp, does the ~ resolve to ~/ ? That is a guess, I cant verify that's what is happening.  But it seems inconsistent, and therefore confusing.  Is this a bug in scp? or is there something about tilde I am missing? Request Web Page in c# spoofing the Host I need to create a request for a web page delivered to our web sites, but I need to be able to set the host header information too.  I have tried this using HttpWebRequest, but the Header information is read only (Or at least the Host part of it is).  I need to do this because we want to perform the initial request for a page before the user can.  We have 10 web server which are load balanced, so we need to request the file from each of the web servers.    I have tried the following:  HttpWebRequest request = (HttpWebRequest)WebRequest.Create("http://192.168.1.5/filename.htm"); request.Headers.Set("Host", "www.mywebsite.com"); WebResponse response = request.GetResponse();   Obviously this does not work, as I can't update the header, and I don't know if this is indeed the right way to do it. If $2^n+1$ is prime, why must $n$ be a power of $2$? A little bird told me that if $2^n+1$ is prime, then $n$ is a power of $2$. I tend not to trust talking birds, so I'm trying to verify that statement independently.  Suppose $n$ is not a power of $2$. Then $n = a \cdot 2^m$ for some $a$ not a power of $2$ and some integer $m$. This gives $2^n+1 = 2^{a \cdot 2^m}+1$. Now I suspect there's a way to factor that, but I don't see how. Can someone give me a hint? What's the term for denying something so as to raise doubt? Topical example:  'There was a scuffle outside the local pub. There appears to be no connection with religious extremists.'  ...but now you're wondering if there was. It's a nasty tactic used to raise fear and doubt - deliberately calling attention to something by explicitly denying it.  What's the term for this? How to reinstall Windows 10 on new hard disk I've been using Windows 10 for a couple of month now (joined the Insider Preview).  Now my hard drive started ticking so I've bought a new SSD and I want to move the windows installation to the new hard drive, which has been connected to the computer (unpartitioned). I don't mind and I even prefer reinstalling it over again.   Since I have the free version of Windows 10 pro, can I still reinstall it anew? Does the windows 10 installation offer disk management and partition like the older Windows installations used to? How should I reinstall Winodws 10 x64 the easiest but still remain on free mode? I can't not be pregnant This is a quote from a  where she talks about her miscarriage:     "It was awful," she told the Daily Mail's You magazine. "It happened really late, and I wasn't expecting it at all. "For a long time I just couldn't understand that it had happened and why. I was like 'But I can't not be pregnant. I'm already past the first trimester, and I have three car seats in my head.' To this day I feel like I'm missing that kid. But it wasn't meant to be and you have to trust the universe. "   What does she mean by saying "I can't not be pregnant?" Is this "can't not" construction a grammatical and common usage? Problem with Non English(Farsi, ...) subtitle Prove equation with binomial coefficient Given an instance of System.Reflection.Assembly. How to remove all files and subdirectories in a directory WITHOUT deleting the directory in bash? Is there a command to remove all files and subdirectories in a directory without deleting the directory?  For example if I have directory dontDeleteMe with subdirectories 1, 2, 3 and each subdirectory has a few pictures in it, how can I remove the subdirectories 1, 2, and 3 and all the files in the them, without removing the parent directory dontDeleteMe? Match the size of multiple background images In  tutorial in the first couple of minutes it is explained how to set the dimensions of a cube and match the background images to this mesh. I have tried to get it right but till now I did not succeed. This is what the creator of the tutorial says in the comments:      I'm keeping only one mesh and just changing the x and y values of my   background images you can see me add at 3:00. We want all the   background images to match that one mesh.   Here are my images:     I think front and back images match to the mesh. But for the right, left and top view I only get one dimension matching. I don't see how you can match both dimensions matching without changing the mesh How do I concatenate const/literal strings in C? What keeps mass from turning into energy? I asked this question  but I haven't gotten a useful answer. Could you tell me the difference in meaning between these sentences?        Do you think you will visit them next week?     Will you visit them next week?     Are you going to visit them next week?     Are you visiting them next week?     Are you going to be visiting them next week?     Are you planning to be visiting them next week?     Do you plan to visit them next week?      Will there be any difference in the answers?        I think I will visit them next week.     I will visit them next week.     I am going to visit them next week.     I am visiting them next week.     I am going to be visiting them next week.     I am planning to be visiting them next week.     I plan to visit them next week.      Can I use "planning to" instead of "going to"?  (E.g. "Are you planning to visit them next week? — Yes, I am planning to visit them next week.") Which of these sentences show that the subject of conversation has already been discussed? For example, I talked with a friend of mine about my plans to visit somebody. So my friend is aware of my plans.  And my last question. Which of these seven sentences express that the action will certainly take place? How to type directly with keyboard the U+200C character? How to type directly with keyboard the U+200C character in Notepad or other places... in Windows 8.1? (without depending on a certain font)  I don't want to copy and paste ways. I don't want any complicated ways. I just want something like Alt+### for typing U+200C Directly at any text area in windows 8.1 without depending to a certain font. Just like ALT+129 for U+200B.  (I do not need ALT+129, That's for U+200B. I need U+200C)  the U+200C character name is: ZERO WIDTH NON-JOINER (ZWNJ)  Here is the U200C character info: How can I put the computer to sleep from Command Prompt/Run menu? I know that almost everything on Windows, like opening any sort of application, can be done from the command prompt or from the Run menu.  How can I put my computer to sleep or shut it down? What is the command for that?