Little bug in this year's Winter Bash presentation
Hat duplicates when info is expanded
Is it possible for information to be transmitted faster than light by using a rigid pole? var/log/syslog growing indefinitely in size The disk that contains Ubuntu on my computer is 115GB in size.  When the disk was 114.7GBfull.  I started deleting some files here and there to free up around 5GB.  But I noticed the disk was 114GB filled again. I thought it was some cache or swap thingy so didn't give it much thought and went ahead and freed around 40GBby shifting some media files out of the disk.  I have a notification in an hour or so that the disk is full yet again!! 40GB!!! All gone!  So I debugged the problem down to the /var/log/syslog file which was initially definitely less than 20GB. I know this because /var folder was 17GB before I cleared the memory.  /var/log/syslog file is currently 55.9GB!  Could someone be so gracious to explain this anomaly? Is this a bug? Or am I affected with some malware or virus? Let $R$ be an integral domain. If $x \in R$ is prime, then $x$ is irreducible. How can I save my hardcore map after I die? My brother jumped into the voice of the doom in my Hardcore Creative map. I didn't press the ΄΄Delete This World΄΄ button yet. Deleting external/auxiliary files? The collection of all subsets of $\mathbb{Z}$ is uncountable, due to   But how can I prove that the collection of all finite subsets of $\mathbb{Z}$ is countable? Laser positioning on barn door tracker What does "sudo apt-get update" do? Is the electric force a vector or a vector field? I was wondering if quantum particles do actually  exists in two different states simultaneously and if it has been proven they do indeed exists in a superposition of states.  How has it been figured out since observing it would collapse the wave-function into one single state (two superposition of states into one ) as it has been mentioned in the Schrodinger's cat experiment? Greek numbering Django: AppRegistryNotReady() Suppose that C is a closed convex subset of $\mathbb R^n$ and $x \in \mathbb R^n$. The projection of $\mathbf x$ onto C is the closest point $\mathbf y \in C : \mathbf z = \mathbf y$ minimizes ||$\mathbf z - \mathbf x$||$_2$ over all $\mathbf z \in C$.  (a) Show that the minimum exists.  (b) Show that there is only one minimizer: that is, show that if $\mathbf y_1$ and $\mathbf y_2$ both minimize ||$\mathbf x - \mathbf z$|| then $\mathbf y_1 = \mathbf y_2$   My ideas:  For (a), to show that the minimum exists I will need to show that it is closed and bounded. We already know it's closed because C is a closed convex subset so I just need to show it's bounded. Am I wanting to minimize ||$\mathbf x - \mathbf z$||$_2$? This is just the Euclidean norm which would be $\sqrt{(\mathbf z - \mathbf x)^2}$=$\sqrt{\mathbf z^2 -\mathbf z \mathbf x -\mathbf x \mathbf z + \mathbf x^2}$. I'm not sure where to go from here...  For (b) I want to use proof by contradiction- so I will assume that $\mathbf y_1$ and  $\mathbf y_2$ both minimize the function and then I'll somehow see that they are in fact equal. How do I set up this argument? How to set the close-laptop-lid-action? How to connect RDS from a different account with allowed IP in AWS? Calculating peaks in DEM using GRASS Been doing tests in sandbox in which I've created about a million accountshares that I need to get rid of for testing.   I'm trying data loader in bulk api mode to export than delete but I keep getting:     InvalidBatch : Failed to process query: QUERY_TIMEOUT: Your query request was running for too long. Trying again later.;   Not sure if I should be waiting longer? Any other options or dataloader configurations I should be looking at?  EDIT  I've been trying with batch apex jobs yet still having issues.   Script  string str='select id from AccountShare where lastmodifiedbyid =\'0050P000007Kfy2\' limit 10000'; sharedeletebatch bdt=new sharedeletebatch(str); Database.executeBatch(bdt); system.debug(bdt);   Batch  global class sharedeletebatch Implements Database.batchable&lt;sobject&gt; {       global final string query;      global sharedeletebatch(string q){            query=q;      }       global Database.QueryLocator start(Database.BatchableContext BC){        return Database.getQueryLocator(query);      }      global  void execute(Database.BatchableContext BC,List&lt;SObject&gt; scope){          delete scope;      }     global void finish(Database.BatchableContext BC){     }   }      First error: [REQUEST_RUNNING_TOO_LONG] Your request was running for too long, and has been stopped. Why is the product of all units of a finite field equal to $-1$? Suppose $F=\{0,a_1,\dots,a_{q-1}\}$ is a finite field with $q=p^n$ elements. I'm curious, why is the product of all elements of $F^\ast$ equal to $-1$? I know that $F^\ast$ is cyclic, say generated by $a$. Then the product in question can be written as  $$ a_1\cdots a_{q-1}=1\cdot a\cdot a^2\cdots a^{q-2}=a^{(q-2)(q-1)/2}. $$ However, I'm having trouble jumping from that product to $-1$. What is the key observation to make here? Thanks! I have installed the pimd service by means of apt. This comes with an upstream systemd unit file (/lib/systemd/system/pimd.service).  I want the service to be restarted when for some reason it gets killed, hence I wish to add the line Restart = always in the unit file.   However, I don’t want to modify the upstream unit file.  Is there any workaround for this? How to cut the non-overlapping part of 2 shapes in Illustrator CS6 I have 2 shapes (see below) a circle and a shape of the US. I want to remove the part of the US that falls outside the circle. How is this possible?    Thanks