In an anti-matter universe, when an anti-matter black hole is consuming a large anti-matter star, would it emit anti-matter gamma radiation, or would gamma radiation be the same in either a matter or anti-matter universe?
I know what anti-matter is and how when it collides with matter both are annihilated. However, what about anti-photons? Are there such things as anti-photons?  I initially thought the idea preposterous. However I am curious because, if anti-photons don't exist, then anti-matter could theoretically transfer its energy to normal matter - through the mechanism of light. Is it right?
Fancy vertical timeline I'd like to have a timeline as similar as possible to this with the addition of being able to add a logo at the left of each textbullet, but I've got no clue at all:    Thanks very much in advance for any help :)  p.s. I've stumbled upon this answer () but I don't how to modify it to get what I want! Overlapping matches in Regex I can't seem to find an answer to this problem, and I'm wondering if one exists. Simplified example:  Consider a string "nnnn", where I want to find all matches of "nn" - but also those that overlap with each other. So the regex would provide the following 3 matches:   nnnn nnnn nnnn   I realize this is not exactly what regexes are meant for, but walking the string and parsing this manually seems like an awful lot of code, considering that in reality the matches would have to be done using a pattern, not a literal string. Reason for the current trend to use «she» as the gender-neutral pronoun? There are some questions on gender-neutral pronouns both  and on .  User Christine Letts :     In academia, there is currently a   movement toward using the feminine   pronoun at all times.   I wonder why that is. I came across several examples on papers I read, but the only one I can remember at the moment is a book: Seth Godin's . While some might not be comfortable labeling it as part of academia, it suits my point perfectly. Every time he refers to a person, he uses the feminine pronoun.  User Senseful  the following, potentially identifying affirmative action as the precursor for this trend.     I remember reading somewhere that it   was recommended to use the opposite of   what most people stereotype the   profession as. So, for example, when   talking about a chiropractor, you   would use "her", and when talking   about a secretary, you would use   "his".   So, where do you think this trend comes from? I'm looking into using Named Credentials (spring '15) to simplify apex callouts to an external web service.  I actually thought, based on the documentation, that this would help, and I'm referring correctly to the Named Credential in my code and have also given my profile access to the NC, but I'm faced with this error when I do the callout:     System.UnexpectedException: You don't have permission to view this   data. Ask your administrator to set up authentication for the external   data source   This seems to say that NC are tied to the use of External Data Source, which is absolutely unrelated to what I want to do, and the documentation doesn't mention that they are a requirement.  Have any of you run into this error when testing out Named Credentials? Recently I have been working on a mini-game that gives a few players custom spawn eggs. I want the mob to simply have a name and be on a team. I'm attempting to use this command:   /give @p[x=-102,y=48,z=81,distance=..1] shulker_spawn_egg{Team:PurpleTeam,CustomName:"\"Purple Turret\""}   It does give the player a spawn egg, but the resulting shulker spawn does not have a team or a name. Any ideas why this isn't working? How do you unpin and move the form in the Visual Studio designer? How to convert light activated switch Show the two fields are not isomorphic Let $p,q,r$ be prime integers with $q\neq r$. Let $\sqrt[p]q$ denote any root of $x^p-q$ and $\sqrt[p]r$ denote any root of $x^p-r$. Please show that $\mathbb{Q}(\sqrt[p]q)\neq\mathbb{Q}(\sqrt[p]r)$.  By Eisenstein we know the two polynomials are irreducible and so they are minimal polynomials and both have degree $p$. If the original question is "What time is it?" and I want to communicate it to another person, are these Embedded Questions OK?        I don't know what time is it.       or        I didn't know what time was it. (if communicated later) I'm new to Ubuntu, it looks like it is better than Windows. Last day I tried to install Kget (the download manager) but during the process my computer suddenly stopped working. So I had to switch it off. After I logged into Ubuntu again I can't install any program. The Ubuntu Software Center says:  Items cannot be installed or removed until package catalog is repaired. Do you want to repair it now?   After I clicked repair it says (after few seconds):  Package operation fails - The installation or removal of a software package failed   I've tried several times, but the same problem occurred. Can anyone tell me a solution for this problem? Are the various "Zelda" games supposed to take place in a common universe? How to Generate surface from points Hi Guys,  I have a set of points in 3D. How can I convert this into a surface ? I want to make sure all of the data in my plugins/themes is handled securely  before entering the database and before being output to the browser. My problem is that there are situations where the API handles the sanitization for you -- like when saving post meta fields -- and others where the plugin/theme author is wholly responsible for doing it -- like when saving custom settings.  For the scope of this question, I'm not concerned about validating data at the domain level -- e.g., checking that an Age field on a form is between 0 and 120, or that an e-mail address is valid. I'm only concerned about security -- e.g., escaping SQL queries to avoid SQL injection when saving to the database, or sanitizing data that's output to HTML templates to avoid XSS.  For output sanitization, I know that you always need to use functions like esc_html() and esc_attr() when echo'ing variables into HTML templates. But, what about when using ? Do they all sanitize the output already? If so, for which context (general HTML, tag attributes, etc)? Some functions have variants for different contexts (like the_title_attribute(), but most don't.  For input sanitization, I know that I need to use $wpdb-&gt;prepare() when making manual queries, but what about when using the Settings API to create a plugin settings page, or saving post meta fields for a custom post type?  Right now I've just been digging through Core and reading tutorials every time I use a function to find out if it sanitizes or not, but that's error-prone and time consuming. I'm hoping to find some kind of comprehensive list of all the possible situations and whether or not the API handles it. e.g.,  API validates/sanitizes   Saving post meta with update_postmeta() Saving user meta with update_user_meta() Outputting a post title - use the contextually appropriate variant of the_title() etc   You have to manually validate/sanitize   Saving plugin options with the Settings API. Pass a callback as the 3rd parameter of register_setting(). Direct database queries: Wrap the query in $wpdb-&gt;prepare(). Outputting variables in HTML. Use esc_attr(), esc_html(), etc etc   I'd also be interested to understand why the API provides it in certain situations, but not others. I'm assuming it has something to do with the unknown nature of the data, but would love to hear a thorough explanation. Max Serial Cable Length? What is the maximum length of serial cable I can use, to connection work properly? Is length of serial cable in connection with baud rate? I am using about 5 meter cable at speed 38400 bauds and RS232 communication, is it too long? I am planning to visit London for 6 days from the US. I have given my biometrics and when I was preparing to mail my documents to the UK visa processing center in the US, I used this link from the UK government website to cross-check the documents to be sent to the processing center.     (Guide to supporting documents).  Something that really surprised me was in Section 4 (documents that should NOT be sent along with the package) was hotel bookings and flights bookings.     Section 4: documents you should not send unless specifically requested      This page provides guidance on the types of documents that are not required to consider your application.         hotel bookings   flight bookings      Typically I have always been asked to provide my travel plans, accommodation plans and proof of them. This is the first time that travel plans and accommodation plans are not asked to be sent. What might be the reason behind it? This really confuses me. Any help in clearing my confusion would be greatly welcome. try+gerund/infinitive (Difference in meaning) I tried to open the door. I tried opening the door   We can use both infinitive and gerund with verb "try" as used in above sentences. Does it change the meaning of the  sentence if use gerund or infinitive?.(here i don't know if the meaning of sentences is changed.)     The same confusion arise in these two sentences.  1.I stopped seeing him. 2. I stopped to see him.(But in case of these two sentence i know the meaning is changed but don't know exactly what the change is). Is it recommended I enter the US only in the city where my university is situated? I'm an Indian student who will be beginning graduate school in the US. Before the start of my program, I want to visit my relatives who live in Atlanta, Georgia. Is it recommended that I enter US in the state my university is located in (Tucson) and then fly to visit my relatives, or is it okay to enter Atlanta? I ask the question with the current political climate in the US in mind.  Is it enough if I have a ticket to Tucson as proof that I am only planning a brief stay in Atlanta?  EDIT: I updated the question to include the cities I'm referring to. Both these cities have international airports. As of the November 2018 core book updates, what changes were made in the latest printings of the PHB that aren't noted in the errata document? Simple bijection $\mathbb N_0 \times \mathbb N_0 \to \mathbb N_0$ I'm looking for a 'simple' bijection $$ \pi \colon \mathbb N_0 \times \mathbb N_0 \to \mathbb N_0, $$  where 'simple' in this context means that it should be as easy as possible to define and it should be self-evident that said function is in fact a bijection. It's a quest for convenience - not minimal complexity in any rigorous sense.  Here are a couple of examples I came up with - none of which satisfy both requirements:   Let $\pi(m,n) = c(2^m3^{n+1})$, where $c \colon \{2^m3^{n+1} \mid m,n \in \mathbb N_0 \}\to \mathbb N_0$ is the order isomorphism (or in fact Mostowski collapse) of its domain under the natural ordering, Let $\pi(m,n) = \langle n,m \rangle$ - Gödel's pairing function, Let $\pi(m,n) = m \oplus n$ - the number resulting from '' $m,n$ (where we imagine both $m$ and $n$ as in infinite decks of cards whose $i$th element is labeled with its respective $i$th digit). ... Code examples, like in the TikZ/PGF manual I like very much the 'side-by-side' code examples in the TikZ/PGF manual...    ... and I would like to use the same thing in a manual I'm writing. I have found the source code for the codeexample environment that the TikZ/PGF manual uses for this purpose (specifically, it's located at /usr/local/texlive/2012/texmf-dist/doc/generic/pgf/macros/pgfmanual-en-macros.tex).  My (probably rather basic) question is: how can I use the same codeexample environment in my own documents? I ask because I tried compiling the example in the related question below, but the file couldn't be found.