TypeError: list object not found in python
Understanding slice notation
Contracting with Levi-Civita (totally antisymmetric) tensor "Prometheus" is meant to be a prequel to "Alien", happening 30 years before ().  If that's the case, how come one of the very earliest spaceships, Prometheus from 2089, has a spiffy new technology, while Nostromo has antique text based CRTs, mechanical IBM style keyboards, and all the associated technologies screaming "1980s called, and they want their IBM PC back!" ?  The great visuals of this can be seen in this Youtube Video  (ignore the russian voice-over - the guy is a movie critic who is complaining pretty much of the same discrepancy listed above).  Please note that I'm looking ONLY for in-universe answers (movies, scripts, explanations from creative team). I'm utterly un-interested in the obvious out of universe "well, for 1979 Alien film, 1980s technologies was the future, and 2012 movie is expected to look futuristic in 2012, duh" or speculations that make sense but aren't confirmed in canon.          And for those who don't believe me... to quote the immortal quip from Men in Black 2:   Old and busted:        New hotness: Is an Otyugh's grapple different from a standard grapple? In 5e to escape a Grapple check, I know you roll athletics (str) or acrobatics (dex) opposed by an athletics (str) check.  In the Otyugh entry in the Monster Manual it doesn't say there's any check, instead it assigns a set DC for an "escape" (DC 13... which is a str check with a 10 assigned as the "roll").    So the question is:    Does the Otyugh actually make a roll in this instance (like the general rule) or does it have a set DC (for the specific case) OR is it just a poorly communicated version of the GENERAL rule being played out?   A little clarification on this would be AWESOME. In the event of a "specific vs general" scenario, what actually is the "escape" roll?  What modifier is applied? None? Dynamic single-line printing in Python (time?) I have two feature Datasets. Both are Polygons. Dataset A has very big Areas and Dataset B just small ones. Now, B still overlaps in 2 or 3 Zones from Dataset A.   I want to perform a spatial join and put the result comma seperated in just one row like this:  Zone_ID_A  |  Zone_ID_B     1       |   2,3    2       |   2,4    3       |   5    4       |   1,6   I know this is possible with ArcMap but i could not figure out a way to do this in QGIS, any ideas? The performance impact of using instanceof in Java Finding matrix $B$ is not zero matrix where $AB= 0$ Any difference between "Good morning, Brian" and "Good morning to you, Brian" I often hear it on TV when they are talking to a guest.  Normally, if we want to greet Brian in morning, we would say "Good Morning Brian". But many times TV presenters say "Good morning to you Brian".  Why is that? Why do they add "to you". There seems to be no need to do it.  Regards, Why and how is the  of a matrix in $M_3(\mathbb C)$ fully determined by its characteristic and minimal polynomials? And why does it fail for $n &gt;3$?   Thanks. Calculate first difference by group in R Is the phrase "it's just a matter of semantics" meaningless? I hear this phrase from time to time, and I really don't know what it means.  Two people are debating, and one says "the difference between your position and mine is just a matter of semantics."   This would seem to me to be quite an important difference.  That is, if one person means one thing, and the other person means something else, then they really do have different positions.  If they said "it is just a matter of terminology" or "just a matter of phrasing" I would get it.  But if someone says "we differ only what we mean" ... it kinda makes me chuckle because it seems to be saying that their meaning is not important, as if the argument was primary and the positions they take a secondary consideration.  So I started looking around for examples of this. I guess it seems that there is a popular notion that semantics is about very fine distinctions, such as:   Another interpretation seems to be that semantics is the difference between two ways of saying the same thing:   Maybe it is just a way of stopping an annoying conversation:   And then there is some usage that I simply don't understand:    And also:   Still, to me it is just a meaningless phrase.  Am I missing an important meaning here? Proving that $\left( \frac{\partial^2}{\partial x^2} + \frac{\partial^2}{\partial y^2} \right) \lvert f(z) \rvert^2 = 4 \lvert f'(z) \rvert^2$ Given $f$ entire show that $$ \left( \frac{\partial^2}{\partial x^2} + \frac{\partial^2}{\partial y^2} \right) \lvert f(z) \rvert^2 = 4 \lvert f'(z) \rvert^2 $$ I've come close to getting the exact answer by writing $f(z)$ as $u(x,y)+iv(x,y)$ and realizing the Laplacian of f is equal to zero. This leads to a lot of cancellations but I'm still making mistakes in my computations and I can't figure out where. Any help is appreciated. How should I handle possible revenge downvotes? I don't like such kind of questions on Meta, so I will try to make it a good question and describe all with a details.  Today I down-voted  added a comment with explanations why I down-voted it, and flag it as non constructive (my flag was marked as helpful). An hour later  was downvoted, without any comment left about the reason. Yes, that wasn't my best answer, but in my opinion it answers the question. Well, even if somebody considered my answer incorrect he could add the correct answer, or up-vote the competitive ones. I checked the  who made competitve answer, and he didn't get any rep today for that answer.   It was my second down-vote on Stack Overflow, so I was a little bit down, after that. I think who could considered my answer so completely wrong, and that I thought that maybe it was revenge down-vote. So I checked  of the user I down-voted today, and it was clear that he down-voted some answers today. After I checked that that user cast only 19 downvotes in 8 months, so chances were very big that this was revenge down-voting.  I came to this meta, and searched what I should do in this case. I found that most questions about down-votes, were closed as duplicates. After I found , and found that a team member of Stack Exchange suggested to cast a flag for moderator attention, and explain the situation there.  I did that, and create next flag:     I think after I down-voted this question (and a comment about this), the OP down-voted me in revenge; it's clear from his today's reputation and from timing of my down-vote of his question, and time when one of my answers was downvoted. I cannot be 100% sure about that, but if somebody can check this, and point him that it's not the good way to do.   As you can see, I didn't ask for returning any reputation, or banning that user, I just wanted, somebody to point him, that he did wrong. And after I get this respons on my flag: "declined - flags should only be used to make moderators aware of content that requires their intervention." So in the end I also lost 10 points of the flag weight.  After describing all situation in details, I want to know were exactly I was wrong here. And what should I do next time something like this happens? What do we know about the creature whose skeleton we see in Star Wars? In Star Wars:  Episode IV - A New Hope, C-3PO passes by what looks like a dinosaur skeleton:      What is this creature?  Are they extinct?  How did such a large animal manage to survive in a barren desert? How to make a curve path from scratch given a list of (x, y, z) points? Don't invite people when moving their messages Comment hint not disappearing when I start to type comment If I click "add comment", the comment hint (placeholder; "Request clarification or add information.") is not a hint, but editable text. If I delete the text and click outside of the comment then the hint appears as it should and when I click back into the comment box the hint disappears as it should.   I am on Internet Explorer 10.0.7.  Am I just oblivious and this is how it has always been (having to delete the comment hint), or is this a bug? Index and length must refer to a location within the string Seeking Python script for creating .mxd files? How does Delta baryon decay conserve angular momentum?