Getting into and staying the UK for 6 months or less as an American
Can I use a one-way ticket to come to the UK? Or do I need to show a return ticket to be able to get in?
Solving $x - a \log(x)=b$ Let $a&gt;0$ and $b \in \mathbb{R}$: Assume there exists an $x &gt;0 $ s.t. $$x - a\log(x) = b$$ holds. How can it be determined in closed-form? Why is jumping into water from high altitude fatal? If I jump from an airplane straight positioned upright into the ocean, why is it the same as jumping straight on the ground?  Water is a liquid as opposed to the ground, so I would expect that by plunging straight in the water, I would enter it aerodynamically and then be slowed in the water. Vertical alignment in tabularx X column type I'd like to create a new column type which works exactly like a X column from tabularx but that also has the text vertically centered. I tried with the newcolumntype command but I can't figure out where to put the second column type? Example:  \newcolumntype{n}{&gt;{\centering\arraybackslash}X}   Where should I put the mto specify that the cells content should be vertically centered? How can I visualize the file system usage on Windows? How can I visualize which folders and files are taking up all of the space on my hard drive?  I'm getting some conflicting reports on the size of hard drive contents. Namely what is and isn't there and what folders are actually using the space.   I need to know which of the files or folders the culprits behind all this hidden bloat. Also there should be a print option to get it on paper. Calculate the limit of two interrelated sequences? In a bash script sometimes you need the user to wait some seconds for a background process to finish.  I usually use for example:  sleep 10   How can I add a kind of progressbar to the script, so the user knows how long to wait?  I installed the command bar but I don't understand the manual. Why are the power transmission/distribution systems AC and not DC? I have a python script that checks file path names for corresponding files in a drive location. All of the inputs were originally hard coded, and it works well enough:      import arcpy     import os     shp = r"C:\Users\dotwell\Desktop\Locations.shp"     fields = ["ZdriveLoc"]     f = open (r"C:\Users\dotwell\Desktop\ValMapsTest.txt", "w")     cursor = arcpy.da.SearchCursor (shp, fields)         for row in cursor:             Roll=str(row[0])             if not os.path.exists(Roll):             f.write(Roll + os.linesep)       f.close()   I'm trying to create an ArcGIS script tool from this, and I've only had partial success. I can use   shp = arcpy.GetParameterAsText(0)   to allow the user to select the shapefile. I'd like to then have a drop down list of the fields in that shapefile for the user to select the field that contains the path names, but I can't get it to work. Can someone show me how to generate the drop down? Here's my latest try. It works, but requires the user to type in the field name. It would also be nice for the user to designate the output text file name and location.   import arcpy import os shapefile = arcpy.GetParameterAsText(0) field = arcpy.GetParameterAsText(1) f = open (r"C:\Users\dotwell\Desktop\ValMapsTemp.txt", "w") cursor = arcpy.da.SearchCursor (shapefile, field) for row in cursor:     Roll=str(row[0])     if not os.path.exists(Roll):         f.write(Roll + os.linesep)   f.close()   Here are the parameters in my ArcGIS script tool: I use the code below to produce handouts of my presentations.  When I open the resulting pdf with any pdf viewer, it is viewed correctly, but when I print it, it is always printed very small, no matter the program I use (Okular, Evince, Acrobat...). Bonus to anyone that can make the pdf be printed correctly by Okular under Ubuntu! Thanks!  MWE here:  \documentclass[handout]{beamer} \usepackage{pgfpages} \pgfpagesuselayout{2 on 1}[a4paper,border shrink=5mm] \setbeameroption{show notes on second screen=bottom}  \setbeamercolor{background canvas}{bg=pink}  \mode&lt;presentation&gt; {     \usetheme{Singapore} } \begin{document}   \begin{frame}[plain]     \titlepage   \note{     Notes for the title page } \end{frame}   \section*{Outline} \begin{frame}[plain] \frametitle{Outline}     \tableofcontents  \note{     Notes for the table of contents } \end{frame}   EDIT:   If I place the line "\pgfpagesuselayout{2 on 1}" after the line "\setbeameroption{show notes}" I do not experience the printing problem anymore!! However, the slide preview and notes that appear at the bottom belong to the NEXT SLIDE, instead of to the CURRENT SLIDE!! What is going on with that? jQuery - Is it okay to use $('#ElementId') everytime? Co-Buyer Automobile As a co-buyer on an automobile, can the other party take full possession? Both parties names are listed as the Purchaser's. Only one purchaser signed the retail order for the motor vehicle, and if so, how can one become a no co-buyer? Adding vertical space at the start of a page I'd like to, first thing before writing anything on a page, add some vertical space.  Minimal (non)working example:  \documentclass{article} \begin{document}  \vspace{250px} I want to be further down on the page :(  \vspace{250px} Haha! Sucker :D \end{document}     How can I get the first \vspace to work, just like the second one? Book where wizards learn magic by bonding with crystals that imbue them with powers I read this book a long time ago, but I'm guessing it was written sometime in either the 80's or early 90's. It was a rather long/large book.  Plot summary: Set in a fantasy land of wizards and magic, some kids (maybe) are recruited to learn magic. In the process they find out that wizards are created by being placed in a crashed spaceship that bonds them with crystals that imbue the powers. One of them is able to bond with many/multiple crystals to become very powerful. Developer Accounts for ExactTarget Is is possible to convert a .vdi file into a .iso that can be burned to a cd or dvd and make it like an installer. Or Is it possible to convert virtual machines to physical environments? If $x>0$, $\,x^{1/n}$ tends to $1$ as $n\to\infty$ I am looking for a proof possibly using the sandwich theorem and/or Bernoulli's inequality for proving the following statement:  If $x&gt;0$ then $x^{1/n}$ tends to $1$. Mathematics needed for string theory I'm interested in cutting edge string theory studied by research physicist. I'm wonder what  mathematics is needed and how far am I in terms of mathematics background needed and how much more mathematics do I need in order to study it properly and reach my goal. My mathematics level is at calculus/Linear algebra. Cannot connect to internet after using airmon-ng check kill In new version of Kali 2.0 with updated "aircrack-ng" tool, there is a problem between Internet connection and using cracking tools.   I have my wireless card as wlan0. And the Internet connection is fine too. Then, what I do is:  airmon-ng start wlan0 airodump-ng wlan0mon   Now the airodump-ng doesn't work, saying "Device or resource busy".  In order to run this I have to kill some processes, using:  airmon-ng stop wlan0 airmon-ng check kill airmon-ng start wlan0 airodump-ng wlan0mon   Now the cracking process is up.   I can start cracking, but now I cannot connect to the Internet after the kill process.  On typing iwconfig in terminal, I get this:  root@kali:~#iwconfig wlan0mon IEEE 802.11bgn  ESSID:"myessid"         Mode:Managed  Frequency:2.412 GHz  Access Point: 00:00:00:00:00:00          Bit Rate=108 Mb/s   Tx-Power=20 dBm          Retry short limit:7   RTS thr:off   Fragment thr:off       Encryption key:off       Power Management:off       Link Quality=42/70  Signal level=-68 dBm         Rx invalid nwid:0  Rx invalid crypt:0  Rx invalid frag:0       Tx excessive retries:2  Invalid misc:9   Missed beacon:0  eth0      no wireless extensions. lo        no wireless extensions.   And, on running ifconfig on terminal, I get this:  root@kali:~#ifconfig lo        Link encap:Local Loopback         inet addr:127.0.0.1  Mask:255.0.0.0       inet6 addr: ::1/128 Scope:Host       UP LOOPBACK RUNNING  MTU:65536  Metric:1       RX packets:5604 errors:0 dropped:0 overruns:0 frame:0       TX packets:5604 errors:0 dropped:0 overruns:0 carrier:0       collisions:0 txqueuelen:0        RX bytes:452904 (442.2 KiB)  TX bytes:452904 (442.2 KiB)   There is no wlan0 or wlan0mon. I also restarted the network manager by:      service network-manager restart   But nothing changed. Though it displays wlan0 when checked using ifconfig this time. Why does an object with a glossy shader render in black? How can I change GNOME Shell theme? I've installed the GNOME Shell in Ubuntu 12.04 and I want to change the "Shell Theme", But it doesn't allow me to do that.  The alert says something like: "The GNOME-Shell extension is not activated", and I want to install it with the console, But it returns me an error.  How can I solve this problem?