How do you design UI automated tests to pick alternative steps randomly in a flow?
Random test data: How to do it right?
Prove if $ p$ is a prime of the form $3n+1$, then $p$ is also of the form $6m+1$ Prove that if $p$ is a prime of the form $3n+1$, $p$ is also of the form $6m+1$.  I guess one could use the division algorithm for this; but, what's the best method? Strictly increasing sequence $\{ a_k \}$ of positive integers such that $\sum 1/{a_k}$ is finite Why can't the Klein-Gordon equation with a Couloumb potential describe the hydrogen atom?  Why can the first order Dirac equation explain it? What are the failures? How do I add reCaptcha to a custom form? I need to add a reCaptcha to my form; creating the form then adding the form ID to the reCaptcha settings did nothing. Getting hybrid graphics to work nvidia-prime GT650M What is the translation of what's written below?  I think it may be the poem of the One Ring, but I'm not sure. Without appealing to the axiom of choice, it can be shown that (Proposition:) if $X$ is well-orderable, then $2^X$ is totally-orderable.  Question: can we show the stronger result that if $X$ is well-orderable, then so too is $2^X$?  Proof of Proposition. Pick any well-ordering of $X$. Then the lexicographic order totally orders $2^X$.  More explicitly: for any two $f,g \in 2^X$, define $f &lt; g$ iff   there exists $x \in X$ such that $f(x) \neq g(x)$, and if $x \in X$ is minimal such that $f(x) \neq g(x)$, then $f(x)=0$ and $g(x)=1$.   It can be shown that $&lt;$ totally-orders $2^X$. Ubuntu 19.04 and Gnome desktop icons What is the difference between 32-bit and 64-bit Ubuntu? I've heard the 64-bit platform performs better and can detect more than 4GB of RAM. Also, while some apps haven't ported to 64-bit yet, ia32-libs lets a 64-bit machine run them.  If so, why not promote 64-bit over 32-bit? I need to make Windows 7 STOP disabling the wifi adapter when the wired LAN is connected This is a Dell Latitude E6430. There is a setting in the bios to control this behavior and I have DISABLED it but it still happens. I am also running the latest bios.  When I plug in a network cable the wifi adapter becomes disabled. I need it to stay enabled. What else could be making this happen?  EDIT: The reason I need to do this is because with NETSH WLAN commands you can create a wifi hotspot by sharing the internet connection on the wired adapter and broadcasting a ssid on the virtual wifi nic. I do this all the time but it's not working on this laptop. I'm wondering if it's a network security thing where I am. I'm going to try from my hotel tonight and report back. I just ran the following command in a directory with several files, some owned by root, some by a normal user. I got a strange message:  $ sudo chmod -rwx * chmod: example-file: new permissions are ----w----, not ---------   Why the heck does chmod refuse to clear all permissions, if a file had group write rights? What is the thought behind this behaviour?  And is there a way to force removing all permissions in one step, without having to execute sudo chmod g-w * afterwards? This is what I'm trying to do:  I have a website A where I make configuration changes and add other stuff. Now I create a website B. I would like to add the configuration changes from website A to this website.   I know the UUID of both websites have to be the same (like staging &amp; production environment). In "" they explain how to do this with drush cget system.site.   The problem is when I run drush cget system.site in my website A I get the following drush error:     Command config-get needs a higher bootstrap level to run - you will need to invoke drush from a more functional Drupal environment to run this command.                                                               [error]   The drush command 'cget system.site' could not be executed.                                                                                                                                                           [error]   Drush was not able to start (bootstrap) the Drupal database.                                                                                                                                                          [error]   Hint: This may occur when Drush is trying to:    * bootstrap a site that has not been installed or does not have a configured database. In this case you can select another site with a working database setup by specifying the URI to use with the --uri parameter   on the command line. See drush topic docs-aliases for details.    * connect the database through a socket. The socket file may be wrong or the php-cli may have no access to it in a jailed shell. See  for details.   Drush was attempting to connect to:  Drupal version         :  8.0.0-rc1  Site URI               :  http://default  Database driver        :  mysql  Database hostname      :  localhost  Database port          :  3306  Database username      :  root  Database name          :  s_1  PHP executable         :  /Applications/MAMP/bin/php/php5.5.10/bin//php  PHP configuration      :  /Applications/MAMP/bin/php/php5.5.10/conf/php.ini  PHP OS                 :  Darwin  Drush script           :  /Users/myname/.composer/vendor/drush/drush/drush.php  Drush version          :  8.0-dev  Drush temp directory   :  /tmp  Drush configuration    :  Drush alias files      :  Drupal root            :  /Applications/MAMP/htdocs/s1  Site path              :  sites/default  Sync config path       :  sites/default/files/config_bZM1aJhLcWGpFZJEzfEw_pKF4g71jOdkSRti30k540BAwE9GQ4U6p469a9VxyJS4j4JVfC58qg/sync   I've installed the latest version of drush .. . I'm working with the release candidate of Drupal 8. Is there another way to get my UUID? Or do you have a tutorial or a video/blogpost of somebody who already did this?  UPDATE:  Ok, I was able to retrieve the UUID from website A and changed the UUID in website B so they have the equal UUID.  After that I changed the system site slogan of website A.  Then I did an export of the configuration in website A. But when I tried to import it in website B I got 137 new files to sync .. . The UUID is different in all files like this:    When I tried to synchronize I got the following error: Why did $id disappear after the EOF Free, open-source substitutes for Mendeley? In Android, is it possible to block apps from accessing the Internet? Many apps will often connect to remote servers in the background, including Google's own apps or system services. Over time this can eat away at a user's data limit set by a mobile carrier. Does Android allow an app to act as a firewall whereby the user can select which apps have access to the Internet? Or does the device have to be rooted to have that ability? What are the rules and limits of Accio spell? We know that Accio spell (aka ) has some limits:   It can be blocked (e.g. Harry couldn't Accio the Diadem in RoR in Deathly Hallows). Many more failures are listed on Wikia.   But what are the exact full rules and limitations governing the spell in Harry Potter world?   Distance?  Line-of-sight?  Knowing exact or approximate location?  Specificity of item (e.g. "Accio Broom" seemed to work for Weasleys in OotP to bring their locked-up brooms - why not just a random broom?) Types of Accio-able stuff? Can you Accio water? Lump of earth? Gases/liquids/etc...? Can you Accio based on jQuery selector (or an SQL where clause), for lack of a better description? E.g. "Accio the book that has the word 'Flammel'"? "Accio biggest green ball from this room"? Can you Accio ALL items of a kind? (the reason I thought of this whole question was seeing "Accio all guns" comment in ). Can you Accio vague stuff? ("Accio meal"). Other rules that can be inferred.   NOTE: While Wikia article has some of the info, it is clearly very lacking in details on specific rules based on specific instances in canon. I'm looking for a fully comprehensive, organized ruleset for the charm, not merely 1-2 tidbits in Wikia article. Motion Tracking objects that go out of frame and re-enter later I am motion tracking a video in which the camera turns away from one scene and then shortly returns to it. However, the segments that went off-screen lose their track and do not continue tracking once the camera returns. I am wondering if there is a manual way to tell a segment where and when to continue looking for it's tracking target. Is this possible to do? Enumerations on PHP I know that PHP doesn't yet have native Enumerations. But I have become accustomed to them from the Java world. I would love to use enums as a way to give predefined values which IDEs' auto-completion features could understand. Constants do the trick, but there's the namespace collision problem and (or actually because) they're global. Arrays don't have the namespace problem, but they're too vague, they can be overwritten at runtime and IDEs rarely know how to autofill their keys without additional static analysis annotations or attributes. Are there any solutions/workarounds you commonly use? Does anyone recall whether the PHP guys have had any thoughts or decisions around enumerations? Number of ancestors 750 years ago I have 2 ancestors, a father and a mother. Two generations back - 4 ancestors. Three generations back - 8 ancestors.  30 generations back: 2^n = 2^30 = ~1,000,000,000 ancestors.  If a generation is 25 years long, 30 generations are 750 years and 30 generations ago the year was 1,267. But the world population was only 400,000,000 people so how can my math be wrong? and is there a way to estimate the number of ancestors I had 750 years ago? What is the meaning of "this" in Java?