How long does it take to send a postcard from Germany to China
Is there any way to find out what happened to a post card sent from other country?
Determine whether a number is prime How do I determine if a number is prime?  I'm writing a program where a user inputs any integer and from that the program determines whether the number is prime, but how do I go about that? IP address of host of Wi-Fi ad-hoc network? I often create a wireless ad-hoc network on my laptop running Windows 7. Now I'd like to connect to it using standard HTTP from my . I've tried 192.168.1.1 and that doesn't work. What should the address be so I can connect? How to create a custom UI? I was watching this  on making a custom UI tab using Python, and in the line from bpy.types import Menu, Panel, UIList, I see the names of objects that look like they can all be used to make different UI elements. Does bpy.types contain all the objects that people use when they want to make custom UI elements? Reputation for graph is off by a day So when we view reputation, there is graph view. However, it seems to be off by a day. Here's what I mean:   I'm sure 70 + 20 + 15 is not 15. Its 105, which is what we see below:   And 40 + 10 is NOT 105, unless you did  :)     Anyways 40 + 10 is 50:   So yeah. Did you do what that post on codegolf says? Devs better fix that :) Journal vs conference publications when looking for a job in in computer science I'm currently a post doc in theoretical computer science and I have a double digit number of conference publications, about half of which are at so called "tier 1" conferences (SODA,STOC,...). Unfortunately I only have 1 journal publication so far, mainly due to coauthors dragging their feet.   Will the lack of journal publications have a great impact when applying for a faculty job in cs-theory at some point, and is it advisable to try to up this number before applying? Or is this fully compensated by having sufficiently many conference papers? Get value of R, G, B by color Recalculating full extent of File Geodatabase feature class? How can I stop Ubuntu Dock from extending to the edges? By default Ubuntu Dock in Ubuntu 17.10 and later releases always extends to the edges (top-bar-to-bottom if placed on the left or right and left-to-right when placed at the bottom) even when it's not filled with icons. Is there a way to prevent this behaviour (i.e. I want to make the dock-length flexible so that as the number of application icons in the dock increases, it should expand accordingly)?  ➡️➡️➡️  In other words, is there a way make Ubuntu Dock look like a &quot;proper dock&quot; instead of a side/bottom panel with full-height/width? Is it possible to be admitted to a masters in Germany with a 3-year bachelors from another country? About inter-city and inter-country bus services in Europe I am planning a month-long trip in mid-June to Europe; mainly Italy, Switzerland, France and Spain in that order. I'll like to know about a bus service that I can use while in a country, and to travel from one country to another.   I found this  provided by Eurolines, can this be used within a country for eg.Rome to Florence? I'll really appreciate if somebody can guide which bus service are available in each country and can help travel from one country to another or is it better to book point to point rail tickets. How to disable SSLv2 or SSLv3? Recently I have opted for broadband connection which is coming directly cat5 cable with RJ45 port to my laptop. They have provided me with IP address, default Gateway, subnet mask, preferred DNS and alternate DNS server information. Also the username and password.  The Modem model is Beetel 450TC1 which is actually an ADSL+2 Router. The modem has 4 lan port and one RJ11 port (for internet).   Can I use this modem as a wireless hotspot without connecting the RJ45 cable directly to my laptop?  If yes, can anybody help me with that? Show that total orders are maximal orders A set $X$ together with a binary relation $\leq$ such that for all $x,y,z\in X$,  $O1$. $x\leq x$  $O2$. $x\leq y$ and $y\leq x$ then $x=y$  $O3$. $x\leq y$ and $y\leq z$ then $x\leq z$  is called an ordered or sometimes a partially ordered.  An ordered $(X,\leq)$ is called a total order if for all $x,y\in X$, either $x\leq y$ or $y\leq x$.  Question: Show that total orders are maximal orders  My question: is there a typo in the question?  What is a maximal order? How can I prove the question, can you help? Thanks... I was wondering if there is any rule in English that forbids us to say A Happy New Year when we wish someone Happy New Year? I know that we just say it like that, but I was trying to find the rule which would explain this. Thank you for your help. A few years ago, I applied for a UK visa. The visa was initially refused and I had no rights of appeal. However, the refusal letter had some glaring mistakes and I sent an email to the Embassy. The refusal was "overturned" by an ECM.  I am now making an application for a visa which has the question "Have you ever been refused a visa?". How should I answer it? when I look at my Nexus 5 with android 5.1. battery screen, I can see something like this:    Screenshots (click images for larger variants)  Sum of all per-app percentages in list is 10. However as you can see, there is 60% battery consumed (40% remaining). So, what is the deal here? Who consumed 50% battery? Or what do the percentages next to apps mean?  As you can see, screen was on just for few short times, the same for awake, and yet battery life about 18 hours? I dont get it.  Also, I found this issue reported on AOSP, but noone from google seems to care: Please explain the meaning of "otherwise than" in this sentence Please explain the meaning of the second part and explain "otherwise than" in part b     a person’s UK property business consists of:      (a) every business which the person carries on for generating income from land in the United Kingdom; and      (b) every transaction which the person enters into for that purpose otherwise than in the course of such a business. elementary row operation change the eigenvalue of a matrix I know that elementary row operations may change the eigenvalues of a matrix, but if these operations don't change the determinant, why should change the eigenvalues??  Thanks How do I install, update and remove GNOME Shell Extensions? I am running Ubuntu GNOME and would like to know how exactly I can install, uninstall, upgrade, deactivate, and activate GNOME Shell Extensions. How to install bicycle pedals without a notch on the spindle? I bought a pair of bicycle pedals that to my surprise had no notches on the pedal spindle to use when tightening them. I managed to screw them in by hand, but they are not quite tight since I can't use a spanner on them. So what would be the correct way to tighten them? Are there any special tools or similar that I'm supposed to use?  The offending pedals can be seen below. The spindle is, as you can see, completely smooth.