Why is the ticket from an airport further away half the cost?
Why is a nonstop flight sometimes more expensive than multiple connections?
Difference between live and neutral wires In domestic electrical circuits, there are 3 wires - live, earth and neutral. What is the difference between the live and neutral wires?  As there is AC supply, it means that there are no fixed positive and negative terminals. Current rapidly switches direction. Does that not mean that both the live and neutral wires carry the same amount of current, alternatively? Why is the neutral wire called 'neutral'? How to detect if a variable is an array Why don't the White Walkers take the sea route to Westeros After watching 6 seasons of Game of Thrones, we know that the only roadblock for White Walkers is "The Wall" to stop them from attacking Westeros. However, we see that King Stannis attacked wildlings through a ship route without crossing the Wall.  What is stopping the White Walkers from doing the same? They can ask wights to make Ships or rowboats. They have a lot of forests to get wood for making ships. They can simply land at the coast of the North and attack Winterfell or whatever they want. Navigation bar overlapped by status bar A conceptual doubt regarding Forced Oscillations and Resonance While studying about the Resonance and Forced Oscillations, I came across a graph in my textbook that is given below:-  Now, the author writes      As the amount of damping increases, the peak shifts to lower frequencies.   Why does this happen? And does this imply that at higher damping levels one cannot achieve a higher amplitude by setting the period of the forced oscillation to be equal to the natural frequency? This seems strange because, the highest amplitude is achieved when the natural frequency is equal to the driving frequency. But, I guess that the rules are somehow different for the damping case. Python List vs. Array - when to use? Most people know the famous equation:    What were his steps of thinking for this equation that helped us discover so much about our world? What is the benefit/downside to using a switch statement vs. an if/else in C#.  I can't imagine there being that big of a difference, other than maybe the look of your code. Is there any reason why the resulting IL or associated runtime performance would be radically different? Related: Texture mapping with multiple UV maps So, as a newbie relatively new to blender, I started doing some texture mapping (blender internal Render). I created a texture for the main object and a couple of transparent decals to decorate it. (basic effects made in GIMP). Simple stuff, just to know how it works.  After unwrapping, having 2 UV maps made, creating both new material and textures, enabling UV mapping coordination I always end up with:  - all - 1 faces of the cube being covered nicely in the main texture  - 1 face covered in blank material with a decal in the middle of it  - the whole thing partly coated by a huge "stain" of a decal  So, the problem is that I can't layer textures correctly. Is there a way to have one texture covering everything and more transparent ones on top of it? I am working on a bigger project right now and having this ability would be useful How can I install an app given only its APK file? Can I use PCA (or should I use regression) for testing the effect of multiple variables on one dependent variable? I have 2000 soil property measures and 14 different variables like rainfall, temperature, slope, etc. I want to check the effect of those 14 variables on soil property measures, including which variable affects my soil property the most. Is PCA a suitable solution to this? Or should I try multiple regression instead? Finding limit when limit approches to infinity Finding $\displaystyle \lim_{y\rightarrow \infty}\bigg[\frac{y}{e}-y\bigg(\frac{y}{y+1}\bigg)^y\bigg]$   Attempt: Put $\displaystyle y=\frac{1}{z}$ . Then $\displaystyle \lim_{z\rightarrow 0}\bigg[\frac{1}{ze}-\frac{1}{z}\bigg(\frac{z}{z+1}\bigg)^{\frac{1}{z}}\bigg]$  Could some help me to solve it, thanks When I used listings package to import C# code snippet from within my LaTeX file, I got an output as follows.    At the first line, there is an unnecessary white space because of the BOM (Byte Order Mark) that is intentionally added by Microsoft (R) Visual Studio.  I really want to remove it from the output rather than from the C# file, how to do that?   Here is my LaTeX code:  \documentclass{article} \usepackage{listings,xcolor} \lstset{% language={[Sharp]C}, backgroundcolor=\color{yellow!20}, basicstyle=\tiny, keywordstyle=\color{blue}, identifierstyle=\color{magenta}, breaklines=true}   \begin{document} \lstinputlisting{Program.cs} \end{document} Reference - What does this error mean in PHP? $x_{1}...x_{n}$ are independent continuous random variables with common distribution function $F(x)$,consider the order statistics $(x_{(1)},...,x_{(n)})$, compute $E(F(x_{(n)})-F(x_{(1)}))$  I have no idea to this problem, anyone could help me? Thanks! I'm doing a masters course at a different university than I did my undergrad (both in maths). I did well in my undergrad but now I'm finding it very difficult. The shock of the change is hard to cope with.  I'm not just finding it very difficult, but I get zero feedback: we don't have any tests and I was not able to make friends so I don't know how others are finding it. I'm starting to think that I might be an idiot.   How can I build some confidence in my abilities at the same time as I rush and struggle to keep up with the massive rate of new material I need to learn? How might I get myself some reassurance that I can actually pass, or stop worrying about this so much? (I feel terribly guilty using so much money from my family to be here) It's possible that I don't really have a chance at all but knowing that would be fine. How to grep a specific line _and_ the first line of a file? Why do I get the error "failed unmounting /var" during shutdown? I have a fresh install of Debian 9.0.0. It has a separate 1 GB partition for /var formatted at ext4. When I shutdown from the terminal, using shutdown -h now, there is a bright-red error message stating "failed unmounting /var".  What is the fix for this error? What’s the best way to reload / refresh an iframe? Can you choose which version of a game to play on Steam?