Explain who command output in 2nd column
Difference between pts and tty
Which year does Spider-Man: Homecoming take place in? "At the time" versus "at that time" UI annoyances in the suggested edit review on Stack Overflow Books for Condensed Matter after Ashcroft/Mermin What are some good condensed matter physics books that can fill the gap between Ashcroft &amp; Mermin and research papers? Suggestions for any specialized topics (such as superconductivity, CFT, topological insulators) are welcomed. How to change an application Icon I find myself needing to draw lots of elegantly curved paths in TikZ. Ideally, I'd just specify a series of points, and TikZ would calculate the extra data itself to draw a nice series of curves passing smoothly through these points, perhaps with an optional "looseness" parameter that I could specify. But the only way I can find to draw nice curves is by explicitly giving control points, or by manually specifying in and out angles.  I can think up a simple algorithm to do this, which would certainly be within TikZ's power to perform: just choose the in and out angles in a simple fashion based on the relative angles between each adjacent pair of line segments.  Is something like this already built-in? Or can someone cook something up that does the job?  Edit: Jake has provided an answer using the plot [smooth] functionality. This is almost perfect! But it can't do what I need, because it doesn't let me specify tangent angles manually where needed, which is especially important at the beginning and end of the curve. I would have thought this would be a natural and straightforward addition to the existing plot [smooth] algorithm: for every coordinate, an optional angle should be able to be specified as an argument, which if supplied is treated as the tangent angle for the curve at that point. And while we're at it, it wouldn't hurt to also allow the tension to be modified along the path.  A minimal extension to the algorithm would just accept two optional parameters, for the curve tangent at the beginning and end. What is a smart pointer and when should I use one? Aligning equations within multline Deleted user's posts showing in 'First Posts' queue On Scifi.SE, a user had their account deleted this morning.  Also this morning, about half a dozen of "their" posts were in the First Posts queue.  The posts were all roughly a month old, and they all had the same disassociated user#.   one of them.  Why'd this person's posts show up in the First Posts queue?  Why do a deleted user's posts ever show up in that queue, when it's purpose is to help the community provide feedback to new users?  A deleted user is no longer a member of the community, and they're not even going to be able to act on any feedback. Show that product of primes, $\prod_{k=1}^{\pi(n)} p_k < 4^n$ This an interesting problem my friend has been working on for a while now (I just saw it an hour ago, but could not come up with anything substantial besides some PMI attempts).  Here's the full problem:  Let $x_{1}, x_{2}, x_{3}, \cdots x_{y}$ be all the primes that are less than a given $n&gt;1,n \in \mathbb{N}$.   Prove that $$x_{1}x_{2}x_{3}\cdots x_{y} &lt; 4^n$$  Any ideas very much appreciated! Measure the size of a PostgreSQL table row I have a PostgreSQL table. select * is very slow whereas select id is nice and quick. I think it may be that the size of the row is very large and it's taking a while to transport, or it may be some other factor. I need all of the fields (or nearly all of them), so selecting just a subset isn't a quick fix. Selecting the fields that I want is still slow. Here's my table schema minus the names: integer                  | not null default nextval('core_page_id_seq'::regclass) character varying(255)   | not null character varying(64)    | not null text                     | default '{}'::text character varying(255)   |  integer                  | not null default 0 text                     | default '{}'::text text                     |  timestamp with time zone |  integer                  |  timestamp with time zone |  integer                  |   The size of the text field may be any size. But still, no more than a few kilobytes in the worst case. Questions  Is there anything about this that screams 'crazy inefficient'? Is there a way to measure page size at the Postgres command-line to help me debug this? Is there a canonical way to typeset such quantities in equations and inline math?  \documentclass{article} \begin{document} $Re$, $Nu$ are clearly not an option. $\mathit{Re}$, $\mathit{Nu}$ appear ok to me. \end{document} Switching to different font size(s) locally Are comments discouraged in a BibTeX file? biber complains about "junk" in what should be seen rather as commented-out lines in a BibTeX file.  I was wondering if comments are discouraged in BibTeX at all.  \documentclass {article}  \usepackage {filecontents}  \begin {filecontents} {ref.bib}  @book {book1,  author={author 1},  title={title 1}}   book {book2,  author={author 2},  title={title 2}}   @book {book3,  author={author 3},  title={title 3}} \end{filecontents}  \usepackage [backend=biber] {biblatex} \addbibresource {ref.bib}  \begin {document}   \nocite{*}  \printbibliography \end {document}   Here is biber's output:  INFO - This is Biber 2.1 INFO - Logfile is 'mwe.blg' INFO - Reading 'mwe.bcf' INFO - Using all citekeys in bib section 0 INFO - Processing section 0 INFO - Looking for bibtex format file 'ref.bib' for section 0 INFO - Decoding LaTeX character macros into UTF-8 INFO - Found BibTeX data source 'ref.bib' WARN - BibTeX subsystem: /tmp/No7MbpTruX/ref.bib_31209.utf8, line 13, warning: 43 characters of junk seen at toplevel INFO - Overriding locale 'en-US' defaults 'variable = shifted' with 'variable = non-ignorable' INFO - Overriding locale 'en-US' defaults 'normalization = NFD' with 'normalization = prenormalized' INFO - Sorting list 'nty' of type 'entry' with scheme 'nty' and locale 'en-US' INFO - No sort tailoring available for locale 'en-US' INFO - Writing 'mwe.bbl' with encoding 'ascii' INFO - Output to mwe.bbl INFO - WARNINGS: 1 How can PPAs be removed? I've added many PPAs using the add-apt-repository command. Is there a simple way to remove these PPAs? I've checked in /etc/apt/sources.list for the appropriate deb lines but they aren't there.   This is on a server system so a command line solution would be great! "more than one does" or "more than one do"? However, if no x satisfies the equation or more than one x does—that   is the solution is not unique—the problem is said not to be well   posed.   In the line(source: ) above it uses "more than one does", but logically and intuitively it should be "more than one do" since "more than one" means two or more, then it is plural. I have tried my best to interpret it as it is, but hardly can I convince myself to make "more than" collocate with "does" as an adv., which may only make it make sense. Ways of getting a number with $n$ dice, each with $k$ sides Assume the dice are numbered from $1$ to $k$. My hunch is that this will form a normal distribution with a median at $n\cdot\frac{k}{2}$. However, I have no idea as to    turn this fact into an answer (I have a minimal knowledge of stats, but I know that I am missing the standard distribution) and this is probably the wrong approach   How can I approach and solve this problem? (Aside, this is not for a class, stats or other, so any and all approaches welcome).  *Edit: * I want to find the number of ways that the sum of the numbers that are rolled has a particular value, if $n$ dice are rolled, and each has $k$ sides, numbered $1$ to $k$. Does constant charging harm my Android cellphone? I usually disconnect my cellphone from the charger some time after it's fully charged because I'm afraid the battery could lose capacity over time if I don't. However, I believe modern electronics should be able to handle this kind of scenario and automatically stop charging the battery once it's full. Does this apply to modern Android phones? Or do I need to continue disconnecting it all the time? Do mankind and manmade activities/constructions have any effect on the rotation of the Earth? What is the best way to remove texture from a scanned textured photo paper? I have a bunch of scanned old family photos where the photo paper has a texture. Unfortunately, the texture of the photo scans quite well. What is the best way to remove the texture?  (Photoshop CS5)