Have heard police target foreigners and rental cars. Any tips for dealing with them? Suggestions/tactics for driving in Nicaragua?
In Uzbekistan I was stopped, searched and questioned six times in one day.  At the border with Tajikistan, one official tried hiding my paperwork to elicit something from me.  In Kyrgyzstan, I was physically harassed and detained by the police, and about US$30 taken while they searched everything on me and a Dutch backpacker I was going to get food with.  I'm not particularly dodgy looking - it's happening to a lot of backpackers I meet.  Tourists are apparently a prime target for corrupt officials.  Any suggestions or tactics for avoiding these occurrences?  Aside from carrying only photocopies of your passport so that they can't hold your passport ransom, I've not heard many successful tips...
Where is the flaw in this "proof" that 1=2? (Derivative of repeated addition) Consider the following:   $1 = 1^2$ $2 + 2 = 2^2$ $3 + 3 + 3 = 3^2$   Therefore,   $\underbrace{x + x + x + \ldots + x}_{x \textrm{ times}}= x^2$   Take the derivative of lhs and rhs and we get:   $\underbrace{1 + 1 + 1 + \ldots + 1}_{x \textrm{ times}} = 2x$   Which simplifies to:   $x = 2x$   and hence    $1 = 2$.     Clearly something is wrong but I am unable pinpoint my mistake. Do messages from feeds prevent freezing/deleting a chat room? How to check if list item already exist when adding it with how to check Title( Country) if exists in the list. if exists it is necessary to do the update if not it is necessary to add it ?  function AddListItem() {      var listTitle = "Test";     //Get the current client context       context = SP.ClientContext.get_current();     var airportList = context.get_web().get_lists().getByTitle(listTitle);          //Create a new record       var listItemCreationInformation = new SP.ListItemCreationInformation();     var listItem = airportList.addItem(listItemCreationInformation);      //Set the values      var country= $("#Country").val();     var client= $("#Client").val();     // var nb1 = $("#nb1").val();      // var nb2 = $("#nb2").val();       // var nb3 = $("#nb3").val();      // var nb4 = $("#nb4").val();       // // var nb5 = $("#nb5").val();        listItem.set_item('Country', Country);     listItem.set_item('Client', Client);     listItem.update();     context.load(listItem);     context.executeQueryAsync(AddListItemSucceeded, AddListItemFailed); } function AddListItemSucceeded() { } function AddListItemFailed(sender, args) {     alert('Request failed. ' + args.get_message() + '\n' + args.get_stackTrace()); } How does one parse XML files? What is the difference between Θ(n) and O(n)? Sometimes I see Θ(n) with the strange Θ symbol with something in the middle of it, and sometimes just O(n). Is it just laziness of typing because nobody knows how to type this symbol, or does it mean something different? How do you check if a selector matches something in jQuery? In Mootools, I'd just run if ($('target')) { ... }.  Does if ($('#target')) { ... } in jQuery work the same way? How to change material's color in blender game engine? How do JavaScript closures work? Now that I have Google Chrome all set up, I got myself a new laptop. Does anyone have any idea how to transfer my settings, cookies, favorites, etc?   I checked documents and settings\me\application data, and found nothing. Latin Square and Graph Theory How many &quot;$1$&quot; can be selected at most, provided that only one from each row and column of the attached matrix $A$ is selected?(That is, when one &quot;$1$&quot; is selected, no other element can be selected than the row and column where that &quot;$1$&quot; is located.)  Answer: I think $6$ can be chosen.  How can I give this answer in connection with graph theory? I think it has to do with the Latin Square(or Rectangle). But I can't connect and explain. Please help me. I thought a lot, but I could not establish the relationship completely. Thanks... How does the four card limit work? I'm new to the game and trying to make my first constructed deck. My understanding of the card rule is I can only have four cards of one kind.  What does this precisely mean?  For instance, does this mean I can only have four rat cards total or four rat cards of several kinds? If two different cards do the same thing (like  and ), can I have four of each? I thought I'd post this as it illustrates a problem often encountered on ELU.     In structures such as 'football manager', is 'football' a modifier or   a complement of the head noun?   I've seen both terms used as if there were only one possible correct answer. However, I've come across widely differing definitions of both 'modify' and 'complement' as used in grammar. I believe that people stating baldly that this is either one or the other are assuming a grammar that they prefer, rather than giving a balanced overview.  Notice that I intend this question to explore the usage/s of the term 'modify' and of the term 'complement' in this context. There may be overlap with the question of which word-class 'football' fits into, but that decision hardly answers the question. Name finding problem with comment notification feature I just received the following in my Response pane (from ), but you can see it was meant for another user.  The @Robert line seems to have found 'Robert' in my name first, instead of Robert C. Cartaino.  I think the comment notification feature should match based on the closest match from the first character in a name (in posting order), and not just the first match found in posting order. What does the 'static' keyword do in a class? To be specific, I was trying this code:  package hello;  public class Hello {      Clock clock = new Clock();      public static void main(String args[]) {         clock.sayTime();     } }   But it gave the error      Cannot access non-static field in static method main   So I changed the declaration of clock to this:  static Clock clock = new Clock();   And it worked. What does it mean to put that keyword before the declaration? What exactly will it do and/or restrict in terms of what can be done to that object? Differential Equations: solve the system Solve the following system:   $$dx/dt=-.2(y-2)$$ $$dy/dt=.8(x-2)$$  This is what I have so far, but I got stuck.. $$\begin{eqnarray} dx/dt&amp;=&amp;-.2y-.4\\ x'&amp;=&amp;-.2y-.4\\ x'+.4&amp;=&amp;-.2y\\ y&amp;=&amp;-x/2'-2\\ y&amp;=&amp;-x''/2-2\\ \\ dy/dt&amp;=&amp;.8(x-2)\\ dy/dt&amp;=&amp;.8x-1.6\\ y'&amp;=&amp;.8x-1.6\\ -x''-2&amp;=&amp;.8x-1.6\\ -x''&amp;=&amp;.8x+.4\\ x''+16x+.8&amp;=&amp;0 \end{eqnarray}$$  when I used the quadratic formula I got stuck. Is this correct so far? Can someone finish it off for me? Illogical GTK theme behaviour on Ubuntu 18.04 Mounting filesystem with special user id set Reference to a figure uses the section's number Delete all files except files with the extension pdf in a directory I've used a number of different *nix-based systems of the years, and it seems like every flavor of Bash I use has a different algorithm for deciding which startup scripts to run.  For the purposes of tasks like setting up environment variables and aliases and printing startup messages (e.g. MOTDs), which startup script is the appropriate place to do these?  What's the difference between putting things in .bashrc, .bash_profile, and .environment?  I've also seen other files such as .login, .bash_login, and .profile; are these ever relevant?  What are the differences in which ones get run when logging in physically, logging in remotely via ssh, and opening a new terminal window?  Are there any significant differences across platforms (including Mac OS X (and its Terminal.app) and Cygwin Bash)?