When I visit YouTube, this is what I see in the upper left corner:    At first I thought that YouTube was thinking I'm in France, but the URL is still https://www.youtube.com and the rest of the site appears in English with no French anywhere.
I see a new logo with CA at youtube.com. Does anyone know what it means?
How do you use the Dungeon Defender's Portal Gun? The topic pretty much sums up my question. I have not yet figured out how the gun operates aside from the fact that it creates Portal portals. The weapon description indicates that it deals 250+ base damage, but how is that damage applied to the monsters? Search in favorited questions? I wonder if it is possible to search in just my favorited questions?  If not, can it be considered as a feature request? Let $A$ be a squared matrix, and suppose there exists an $n\in \Bbb N$ in a way that $A^n=0$. Show that $I-A$ is invertible and that $(I-A)^{-1}=I+A+\cdots+A^{n-1}$    I don't have a clue where to start from. How can I automatically center an image? I use:  \documentclss{mwrep} ... \begin{figure}   \includegraphics{a.jpg} \caption[Long caption]{Caption} \label{pic-a} \end{figure}   How can I make images to be always visible on the center of page? (To be more specific: the center of the image should be between the left and right margin - I use different left and right margins). I don't want to put anything after every \begin{figure} in my document.  Important: I don't want to waste an entire page on a single image at the very center of the page. I want only horizontal alignment. (left &lt;-> right) Where are Time Machine local backups/snapshots stored? Out of curiosity, I'm wondering where in the file system Time Machine stores its local backups/snapshots. Let's say I have a (comparatively) lovely-looking document in LaTeX, full of lovingly typeset, (relatively) complex equations. Now, let's say some barbarians come along one day and decide that the document has to be put into Microsoft Word (2007). ...after the usual mourning period associated with such events, let's say I value my job (more specifically, the bread it provides) enough to get all the text and tables formatted and references organised into the Word document. –...related questions  and – Now I'm looking at the equations with fear and dread. One option of course is to just lift screenshots from the original document, but this is painstaking if I need to refer to parts of the equation in the text. Also, I might need to edit equations on the fly. Anyone know of a free application which allows embedding LaTeX math into MS Word? I've looked at  and  which do roughly what I want... they build LaTeX images from source and embed them into the Word document, allowing to edit the source later... but both are commerical. ...any help in these troubling times will be greatly appreciated. EDIT: Just a note that  offers a 30-day free trial and is working out really nicely... but still, it's not free. Might be a good solution for those with short-term needs, or money. Self-deletion and un-deletion without any changes should reinstate the original close/delete votes I want to prove that $\mathbb{Q}$ is countable. So basically, I could find a bijection from $\mathbb{Q}$ to $\mathbb{N}$. But I have also recently proved that $\mathbb{Z}$ is countable, so is it equivalent to find a bijection from $\mathbb{Q}$ to $\mathbb{Z}$? What are the most suitable filter holders for my Samyang 14mm autofocus prime lens? I've looked into the ones from Haida and Nisi which are both suitable, though they're quite pricey for me currently - does anybody know of any cheaper possible alternatives? I understand there's the 160mm specifically made for use with this lens, though obtaining filters for it is difficult and limited. I'm hoping for something which may be cheaper than both Haida and Nisi, and still suitable for the 14mm lens. Thanks! Power Supply Capacity Formula Proving an identity relating to the complex modulus: $z\bar{a}+\bar{z}a \leq 2|a||z|$ Show that $z\bar{a}+\bar{z}a \leq 2|a||z|$  I was able to check this using some examples which is not ideal for a mathematician way of proving a problem/case/theorem. I couldn't generalize it (prove it). I will be glad if I can be given the hint/proof for this problem. Thank you. Double dispatch in C#? I have heard/read the term but don't quite understand what it means.  When should I use this technique and how would I use it? Can anyone provide a good code sample? What temperature is achieved in focus point by 5000 flat 1x1cm mirrors onto a satellite dish? There is this  ("R5800 Solar Death Ray") where teenager built a 5000 mirror device which concetrates the solar rays which is showing the potency of the mosaic method of concentrating sunlight using elliptical dish. It can fire the wood, boil the water in seconds, melt an aluminum, glass or even burn the whole in concrere or rock.  What is the approximate maximum temperature (could be a range) is achieved by this mirror device in its focus point on sunny day?       The R5800 solar concentrator, replaced by the new R23k, is made from   an ordinary fiberglass satellite dish. It is covered in about 5800   3/8" (~1cm) mirror tiles. When properly aligned, it can generate a   spot the size of a dime with an intensity of 5000 times normal   daylight. This intensity of light is more than enough to melt steel,   vaporize aluminum, boil concrete, turn dirt into lava, and obliterate   any organic material in an instant. It stands at 5'9" and is 42"   across.   Technical details &amp; calculations:     Calculations: Area of dish aperture (elliptical)= (pi x 102cm x   73cm)/4 = 5848 sq cm       Area of focal point (circular)= pi(0.6cm)^2 = 1.14 sq cm      Dish Type= 0.7m x 1m offset focus elliptical.      Concentration Power= 5000x      Output Power Estimate = 560 watts Warning  If you're looking for advice how to make your document look like it's been written in Word, this is most likely not the question you're looking for. This question is mostly of theoretical nature, as it results in tiny differences, which will most likely not be noticed by someone who doesn't allow the use of LaTeX.  Questions that might be more helpful for this matter are:           Question  I learned that MS Word uses a slightly different version of the unit "point" (pt) than TeX does:     The 12 point of Word will be PostScript point, which in TeX would be called 12bp. A TeX pt is slightly smaller: it's 1/72.27 inch, while a bp/PostScript point is 1/72 inch. See also    ( in )  I'm writing a paper that would usually be expected to be "typeset" in MS Word, thus I want to use the same font size as Word would.  How do I set a document e.g. in the "12pt" font size that MS Word would use?  In case it matters, I'm using the article document class, Latin Modern (lmodern) as a font with the T1 font encoding and compile with pdfLaTeX, but input on different set-ups is more than welcome. How can I tell hotels exist that aren't on the booking web sites? There are a ton of sites out there to help book hotel rooms and to aggregate all the different sites to book hotel rooms. These companies make enough money to buy ads on TV, so I won't name them here. I normally poke around 3 or 4 of these as part of planning any trip.  I am now starting some very long term planning for a 6 week South Pacific trip, which includes undertstanding what hotels costs on some very small islands. I have paper guidebooks and I've been looking online. But I come across anomalies. For example, a place which has only 9 hotels listed on the sites I use, and prices range from $1000/night down to $200/night, then when I read the reviews on that cheapest one people are saying "it's nothing special, there are 5 or 6 places just like it here for half the price". Well, not on this site there aren't!  My guess is that many of these places don't have web sites, or don't have online booking, and therefore aren't getting into the aggregators. For some islands I have found local tourism boards with lists of "pensions" and such, typically cheaper than what I can find on the aggregators.    But how can I know? I don't want to assume that popular web sites represent reality, and choose only from places listed there. But I don't want to invest 10-20 hours of research per island only to discover the aggregators had everything. How can I know where the coverage is good and where it isn't, what kinds of hotels are more or less likely to be listed at expedia, trivago, booking, hotels, tripadvisor, and the like? (For example, I don't want to stay at a hostel, so I don't mind if they're not included in online sites.) Are there sites like wikitravel that list places without much of an internet presence?  I'm starting my research over a year before the trip, but wading through hotel pages is not the fun part of the planning so tell me how the smart people do it. Unbiased estimator of a uniform distribution How to upload a file of size 2GB from Apex? Is there any sobject that I can make use of? My friend is buying a digital point-and-shoot camera, which he wants to use to click family pictures including a lot of pictures of their newborn son.  What camera qualities should he be looking for while buying? I need to cast single figures (1 to 9) to (01 to 09). I can think of a way but its big and ugly and cumbersome. I'm sure there must be some concise way. Any Suggestions $T(av_1 + bv_2) = aT(v_1) + bT(v_2)$  Why is this called linear? $f(x) =ax + b$, the simplest linear equation does not satisfy $f(x_1 + x_2) = f(x_1) + f(x_2)$.  Thank you.