How can Valyrian steel kill White Walkers?
How was Jon Snow able to kill the White Walker in S05E08?
Find roots of $3^x+x^3=17$ Find $x$ in the following equation: $$3^x+x^3=17$$ 2.8 mesh select mode hotkey changed The hotkey for mesh select mode (vertex, edge, face) while in edit mode Ctrl + Tab has been reassigned in 2.8. Is there another hotkey assigned for this? Home Electric Panel Questions I’m having a pool put in and the pool guys said they need a 20 amp breaker for the pool equipment. My outside panel says 100 amps (see picture). But my panel inside adds up well over 100 amps. Is this normal?  The breakers never trip even with the dryer, AC, and other appliances running. Easy way to write contents of a Java InputStream to an OutputStream While dabbling in Clojure I've written a very basic program to echo whatever the user types into it. However, it doesn't run in a way that I'm perceiving to be natural. Here's the code:  (defn goo []   (print "echo&gt; ")   (def resp (read-line))   (print resp) )   I would expect the code to run like this (for me typing in foo as the input to read-line):  user=&gt; (goo) echo&gt; foo foonil   But instead, the echo and read-line is switched:  user=&gt; (goo) foo echo&gt; foonil   Why does this happen? Is there a subtlety I'm missing?  EDIT: From Joe's answer, the updated correct solution is:  (defn goo []   (print "echo&gt; ")   (flush)   (def resp (read-line))   (print resp)   (flush) )   Also, the flushes aren't necessary if you use println instead of print. A term for words that change pronunciation with part of speech I'm writing an article on  and some people pointed out that this is completely useless.  My idea is to amend my article with some theories that seemed useless when they are created but found use after some time.  I came with some ideas like the Turing machine but I think I'm not grasping the right examples.  Can someone point me some theories that seemed like the Lychrel numbers and then become 'useful'? Sum of infinite series $\sum_{i=1}^{\infty} \frac 1 {i(i+1)(i+2)...(i+n)}$ Lets define the following series $$S_n =\sum_{i=1}^{\infty} \frac 1 {i(i+1)(i+2)...(i+n)}.$$ I know that $S_0$ does not converge so let's suppose $n \in N$ and define $S_n$ for some $n$. We have $S_1=1$ , $S_2=\frac1 4$ , $S_3=\frac 1 {18}$ , $S_4=\frac 1{96}$ , $S_5=\frac 1{600}$ etc.. the numerator in all results is 1the pattern in denominator is $[1,4,1,96,600...]$ and   that is equal to $n*n!$ Finally I want to prove the general equality: $\sum_{i=1}^{\infty} \frac 1 {i(i+1)(i+2)...(i+n)}=\frac 1 {n*n!}$ Why doesn't this C++0x code call the move constructor? Could 'cogito ergo sum' possibly be false? Travel in schengen countries without carrying passport for non EU citizen Assuming I have a Czech license and break a minor law in Germany which incurs me a certain number of "violation points" (e.g. speeding), would those points be eventually transferred to my Czech license? I would obviously have to pay the fine (either on the spot or by mail), but it's not clear if EU countries exchange data on traffic points.  I would limit the scope to EU/EEA license holders driving within the EU/EEA, to avoid an overly broad question. Also assume that the person in question is resident in his home country and is only visiting other EU/EEA countries as a tourist. Show that an algebraically closed field must be infinite.    Answer  If F is a finite field with elements $a_1, ... , a_n$ the polynomial $f(X)=1 + \prod_{i=1}^n (X - a_i)$ has no root in F, so F cannot be algebraically closed.  My Question  Could we not use the same argument if F was countably infinite? Couldn't we say that if F was a field with elements $a_1, a_2, ... $ then the polynomial $f(X) = 1 + \prod_{i=1}^{\infty} (X - a_i)$ does not split over F?  Thank you in advance How many possible Enigma machine settings? I'm trying to calculate the amount of settings the enigma machine has. I have found several sites regarding this topic, but it seems like there are two answers to my question. The first answer is 158,962,555,217,826,360,000 and the second is 107,458,687,327,250,619,360,000. Where the difference is that in the second answer, it has been taken into account that the notched rings on the enigma could be set as well, giving 26 * 26 = 676 more settings than the first answer.   But which answer is the right one, and why? How many possible different Enigma machine settings are there and how can one determine this number? How can I be a good reviewer? Someday, as strange as it feels to me right now, I might be asked to review an article for publication. A while ago my advisor and I were talking about this, and it hit me that I don't really know how to be a good reviewer, beyond the basics:   Respond timely to things, Make your report clear and detailed, Have actually read the paper, Etc.   Beyond this, though, I'm completely in the dark. So I'd like to ask:     What's some good advice for a first-time reviewer?   My field is math, but I'm really interested in general advice (although advice specific to math, or another field, would also be interesting and useful).    I'd like to make this question "community wiki" or analogous, but I can't seem to figure out how - if someone can do so, please do, and then I will delete this paragraph. Disfigured Feynman Diagrams! bash - problems reading text file and printing line by line Android 4.1: How to check notifications are disabled for the application? Why is a finite integral domain always field? This is how I'm approaching it: let $R$ be a finite integral domain and I'm trying to show every element in $R$ has an inverse:   let $R-\{0\}=\{x_1,x_2,\ldots,x_k\}$,  then as $R$ is closed under multiplication $\prod_{n=1}^k\ x_i=x_j$,  therefore by canceling $x_j$ we get $x_1x_2\cdots x_{j-1}x_{j+1}\cdots x_k=1 $,  by commuting any of these elements to the front we find an inverse for first term, e.g. for $x_m$ we have $x_m(x_1\cdots x_{m-1}x_{m+1}\cdots x_{j-1}x_{j+1}\cdots x_k)=1$, where $(x_m)^{-1}=x_1\cdots x_{m-1}x_{m+1}\cdots x_{j-1}x_{j+1}\cdots x_k$.   As far as I can see this is correct, so we have found inverses for all $x_i\in R$ apart from $x_j$ if I am right so far. How would we find $(x_{j})^{-1}$? How can I get the HTML source of a given web address in C#?