In the prequels we see that both C3PO and R2D2 are Anakin's droids and they clearly both know that he's gone over to the dark side.  I would like to know an in-universe answer for the question; Why did they not tell Luke?      that Vader is Anakin?
At the start of A New Hope, when the corvette is being attacked, C3PO says something to the effect of:     There'll be no escape for the princess this time.   But when Luke stumbles onto Leia's message in R2D2, C3PO seems to not know who the figure in the message is:     I'm afraid I'm not quite sure, sir. I think she was a passenger on our last voyage. A person of some importance, sir - I believe.   Is C3PO feigning ignorance to protect her, or does he really not recognize her?
Answering your own question? Accept it. Why didn't the Ministry use owls to find Sirius? Harry, before the Triwizard Tournament, was able to send owls to Sirius when he was in hiding (not at Grimmauld Place) just by telling them "just find him, will you?", and the owl would come back a few days later with an answer. This doesn't happen with Hedwig only, because, if I recall correctly, he uses school owls as well.  If finding Sirius was as easy as telling an owl "find him", and a 13-year-old wizard could do it, how come the Ministry had no clue as to where he was? They could've sent an owl with a summons and followed it from a distance.  Two theories, neither mentioned in the book, and both a bit unlikely:   He was living as a dog and -hopefully- the Ministry would not be able to recognize him. Unlikely because the owl would have got there anyway, so they would have guessed the dog was Sirius in disguise, not necessarily as an animagus, but maybe he could perform human-animal transfiguration (remember he was brilliant at school).. Kingsley Shacklebolt was already in charge of the hunt and Dumbledore told him Sirius was innocent and all that. Then, Kingsley would have prevented the Ministry from using any method that could've actually worked. Unlikely because they could've used owls before Dumbledore's tip, when Kingsley didn't know Sirius was innocent, and also because Kingsley was quite powerful and had the support of Crouch and others at the Ministry, so if he was in charge, they would probably have succeeded.   Your thoughts? Suppose I am a naturalized citizen of the US, but also a citizen of another country, "XYZ". I then boarded a plane and left the US to another country (maybe not necessarily to XYZ), without first getting a US passport, but using my old, but valid XYZ passport.   In this case what would be the best documents to have for me to gain entry back into the US as a US Citizen without a passport?  Would I need to contact the US Embassy for help in order to be able return?  If the airline does let me aboard to return to the US, even without the US passport, what are the best documents could I show at the border to prove I am a US citizen but that I just don't have a passport, for whatever reason? This works perfectly:  $ inotifywait --event create ~/foo Setting up watches. Watches established. /home/ron/foo/ CREATE bar   However, this just sits there when directory tun0 is created under /sys/devices/virtual/net.  $ inotifywait --event create /sys/devices/virtual/net Setting up watches. Watches established.   Since those folders are world readable, I'd expect inotifywait to work.  So, what am I doing wrong?  Thanks I've had a few concerns over a new form of &quot;spam&quot; - that is, through voting. A while back, I had seen some wild reputation increases to my account, amongst others, that seemingly felt weird - as I've barely participated in asking questions or providing answers. Earlier today, this sentiment was echoed by another user in chat:  and like 250 this month? it seems like someone is spam upvoting  This was another user that saw a 250 rep increase, but has been inactive for quite a while. For a site that hasn't seen more than 5 questions a day, that was really weird. To put things even more out of hand, it seems like each vote has been placed on a question.  I did some investigation of my own, and it seems like I've found a badge hunter. More of a... gold badge hunter. This user is among the top 3 voters of the site. Looking into this user's profile, this user only has under 200 rep, and has posted a single question, which was received differently. One thing caught my eye:  Votes all time              by type 581   up              535    question 1     down            47     answer   Each vote is an up vote (with the exception of one), and there are 535 up votes on questions. There are 535 questions in the entire site. Using reputation stats from user profiles, I came with the conclusion that these votes are...  Done within a short period of time. 5 question votes within a couple of minutes Done in [near] perfect chronological order: The earlier the vote, the earlier the question was asked. As if the user had gone through the list of questions in order, and placed an up vote on each one.   I see this as incredibly problematic. First:  It dangerously inflates reputation. Votes are not done based on their content, but simply for voting. Therefore, reputation loses it value as a way to measure expertise.  It's like serial up voting. Generally, when we hear the term &quot;serial up voting&quot;, we think of a voting ring, where one user continuously up votes another. This is negative for the targeted user. Well, here, we've got a voting ring with the site and this user. A user continuously up votes the site, causing negative damage for the site.  We mix good and bad content. Since low quality questions are a victim of the voting spree, many get meddled with the rest of &quot;good quality&quot; questions, despite being closed as off-topic, too broad, or whatever the reason. We can no longer reliably sort questions by quality with the very system that was designed to help us.   ... And the rest of voting fraud issues outlined in .  I've got a couple questions on this:  Is this comparable to serial voting? Should such votes be reversed? How should we determine whether or not to reverse them?  Should we stop this? Let it be? Is this really that big of a problem for sites? (I would argue that it's less of an issue for graduated sites that receive large amounts of content, but what about beta sites that rarely see more than a few questions a day) There is an option to filter only one color (R,G,B,Y) in my camera. What I want to know is can this effect be achieved in photoshop? And what is this called? I tried googling monochrome and came up with nothing. My camera calls it part color. I would like to draw a squiggly line with an arrow somewhere in the middle of it. TikZ has a pathmorphing decoration that draws a squiggly line and a markings decoration to place an arrow tip. So a solution would be to use them together:  \documentclass{article} \usepackage{tikz} \usetikzlibrary{decorations,decorations.pathmorphing,decorations.markings} \begin{document}  \begin{tikzpicture}  \draw[          decoration={snake},          decorate,          postaction={decoration={markings,mark=at position 0.6 with {\arrow{>}}},decorate}      ]         (0,0) -- (2,0); \end{tikzpicture}  \end{document}   Unfortunately this does not work and results in  ! Dimension too large. &lt;to be read again&gt;                     \relax  l.11         (0,0) -- (2,0);   I suspect there is an infinite recursion going on somewhere.  Is there a workaround? If not, is there a different simple solution to the problem?  (Note: This is probably related to my previous question ) Cooking steak in frying pan, problem with oil splatter I was using canola oil and put the stove top setting on "high - 9". I read plenty of guides suggesting there will infact be oil splatter, but it was pretty excessive and burning my arm with one drop getting near my eye before I stopped. I turned the heat setting down to "medium - 4", where the oil splatter seemed to drop substantially. Before I try to make steak again I'd like to get some clarification  So my questions are:   Which heat setting am I supposed to use? Is that type of oil splatter normal or should I try using a different oil, and if so, what oil? Should oiling the meat instead of the pan help the problem? How to include graphics with spaces in their path? How would you count occurrences of a string (actually a char) within a string? I am doing something where I realised I wanted to count how many /s I could find in a string, and then it struck me, that there were several ways to do it, but couldn't decide on what the best (or easiest) was.  At the moment I'm going with something like:  string source = "/once/upon/a/time/"; int count = source.Length - source.Replace("/", "").Length;   But I don't like it at all, any takers?  I don't really want to dig out RegEx for this, do I?  I know my string is going to have the term I'm searching for, so you can assume that...  Of course for strings where length > 1,  string haystack = "/once/upon/a/time"; string needle = "/"; int needleCount = ( haystack.Length - haystack.Replace(needle,"").Length ) / needle.Length; Existence of subgroup of order six in $A_4$ Show that  the  alternating  group  $A_4$  of all even permutations of $S_4$ does not contain a  subgroup of order $6$.   For me am thinking to write all elements of $A_4$ and trying to find every cyclic subgroup generated by each element of $A_4$, then I have to check whether there exist such a subgroup or not! This is a long procedure for me, I ask if there is a short way to do this. How to set vertex weights using Blender's Python API? Looking at the API docs I found , but It cannot be called in Edit Mode. When I try to call it, I always get:     RuntimeError: VertexGroup.add(): cannot be called while object is in edit mode.   The buttons in the vertex group list use bpy.ops.objects.vertex_group_assign(), but to work with it you have to manipulate selections, this is not nice to do from a script.    Why I try to use VertexGroup.add() in Edit Mode? My script works this way:  Human weight paint a bone, "Arm_1.L", "Arm_1.L" shares vertices with "Arm_2.L" in this case they share half the vertices (4 bone arm rig, trick to have nice deform in certain movements). When script run, all selected vertices that exist in both groups (Arm_1.L and Arm_2.L) will copy the weights of Arm_1.L into Arm_2.L but inverted. This way, I only need to weight paint "Arm_1.L" and "Arm_3.L", the script will fill the weights for "Arm_2.L".  import bpy  # ensure we are in edit mode bpy.ops.object.mode_set(mode="EDIT")  # configurable parameters src_group = "Arm_03.L" dst_group = "Arm_02.L"  obj = bpy.context.edit_object src_group_index = obj.vertex_groups[src_group].index dst_group_index = obj.vertex_groups[dst_group].index  mesh = obj.data sel_verts = [v for v in mesh.vertices if v.select] #sel_verts = mesh.vertices  # SEGFAULT in this line bpy.ops.object.mode_set(mode="OBJECT")  print("Working")  for v in sel_verts:     v1in = False     v2in = False     for g in v.groups:         if g.group == src_group_index:             v1in = True         if g.group == dst_group_index:             v2in = True     if v1in and v2in:         print("True")         obj.vertex_groups[dst_group].add([v.index], 1.0 - obj.vertex_groups[src_group].weight(v.index), 'REPLACE')  print("Finished") How to delete (invalid) files with colon in their name under Windows? Proving Pascal's Rule : ${{n} \choose {r}}={{n-1} \choose {r-1}}+{{n-1} \choose r}$ when $1\leq r\leq n$ A problem with my reasoning in a problem about combinations How can a question be tagged with a tag synonym? The question  seems to be tagged with , which, last I checked, is a synonym of . How is it possible that a question can be tagged with a synonym? Don't synonyms automatically get replaced on questions? T-Shirt print resolution Is there a way to adjust kerning for a specific character combination? What is the difference between "getting robbed" and "getting mugged"? I can't seem to find the difference on the internet between "getting robbed" and "getting mugged". I would appreciate it if you could explain it to me. To show that $2$ | $x^{2n} - x^n$, $n \in \mathbb{Z^+}$ is the following adequate?