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What should I look for when buying a used bicycle? I'm moving to a city where I can ride a bicycle to the grocery store, coffee shop etc. I want to purchase a decent used bicycle. I'm leaning towards a bike that's in between a "10-speed" or road-bike and a mountain bike. What should I look for when choosing a particular bike?  I've never purchased a used bicycle. Other than classifieds (e.g., Craigslist), what types of places can I look? What other issues should I consider, such as size, visual appearance, leaking tires, etc.? How can I make sure it's not stolen? How do different difficulties work on story missions? When selecting a story mission, I can choose between "Easy" and "Hard".  Next to the difficulty, the game displays some kind of level.  However, when you start the mission, you still end up in the common map area with other players.  What exactly changes when you select a higher difficulty?  Is it possible to see other players playing on "Easy" when you select "Hard" before entering the mission zone where respawning is restricted? If we had an airtight container that was large enough, say extended out to the Karman line, would there still be a pressure gradient? If we assume that the pressure at the bottom was $1\ \mathrm{atm}$, would it have the same exact pressure gradient at 6 miles up on the outside? This is assuming that the gravity is still $9.8\ \mathrm{m/s^2}$. What kinds of desktop environments and shells are available? Function representing a forest fire after one time step How to call a parent class function from derived class function? I used the inbuilt dataset stackloss here. I used following R code for creating the multiple regression model.  &gt; head(stackloss)   Air.Flow Water.Temp Acid.Conc. stack.loss   1        80         27         89         42   2        80         27         88         37   3        75         25         90         37   4        62         24         87         28   5        62         22         87         18   6        62         23         87         18  &gt; fit &lt;- lm(stack.loss ~ .,data=stackloss) &gt; plot(fit)   And when I plot the model, the four following graphs are displayed.      How to interpret these graphs? What are the significance of these graphs? How to use these graphs? How to initialize HashSet values by construction? Modelling population with $\frac{dP}{dt}=P(\beta - \delta P)$ Azimuth and Distance, NumericalDigitize, Numerical Vertex Edit, XY tools and other plugins are not on QGIS Plugin Manager version 2.0.1 Will these plugins no longer be available in QGIS 2.0.1? Let me use the following example to explain my question: public string ExampleFunction(string Variable) {     return something; }  string WhatIsMyName = &quot;Hello World&quot;; string Hello = ExampleFunction(WhatIsMyName);  When I pass the variable WhatIsMyName to the ExampleFunction, I want to be able to get a string of the original variable's name. Perhaps something like: Variable.OriginalName.ToString()  Is there any way to do this? Are there other explanations for slow tyre pressure loss? I rode my road bike on Friday and the tyres were at the correct pressure then, around 100psi.  On Tuesday, I jumped on without checking them and quickly realised something was wrong with the rear tyre.  It wasn't completely flat but was fairly soft.  I hadn't gone far so went home and took the car to work instead.  When I got home later, I was surprised to find the tyre, while still soft, hadn't lost all pressure by any means.  It was around 40psi and felt the same as when I left it in the morning.  I decided there must be a slow leak somewhere, but I couldn't find one anywhere, putting the inner under water and going around it methodically looking for bubbles.  I've never failed to find a leak before that way.  I've switched it out anyway because I don't want to mess around with my commute, but I'm curious ... is there another explanation for that amount of pressure loss?  Or must there have been a puncture somewhere that I missed somehow?  The tyres (whole bike) are pretty new and in excellent condition. What's the easiest way to unrar a file? Integral $\int^{ \pi /2}_{0} \ln (\sin x)\ dx$ $$\int^{ \pi /2}_{0} \ln (\sin x)\  dx$$  The answer is $- \frac{\pi}{2} \ln 2$.  I have changed it into $$\frac{1}{2} \int^{1}_{0} t d \ln t^{2}$$  But I didn't get the answer with it. This example illustrates some conflict between xelatex and natbib- and footnote-generated superscripts.  The semi-colon between distinct citations is not typeset as a superscript, nor is the dagger.  The asterisk, however, looks fine to me.  Any suggestion on how to make these auto-generated superscripts look more normal?   Update Mostly fixed, see second screenshot below.  Update 2 Fully fixed!  Alter the MWE below with this code:  \DefineFNsymbols*{safestar}{{$*$}{\textdagger}{\textdaggerdbl}{\textsection} {\textparagraph}{\textbardbl}{$**$}{\textdagger\textdagger} {\textdaggerdbl\textdaggerdbl}{\textsection\textsection} {\textparagraph\textparagraph}{\textbardbl\textbardbl}} \setfnsymbol{safestar}   This comes  Achim Blumensath on the MinionPro mailing list, together with  for the footmisc package.  \documentclass[article, a4paper, 12pt, oneside]{memoir}  \usepackage{fontspec} \usepackage{xunicode} \usepackage{xltxtra} % c/o @wasteofspace, this is the "offending" line \defaultfontfeatures{Mapping=tex-text} \setmainfont{Linux Libertine O}  \usepackage[super]{natbib} \usepackage[perpage,symbol]{footmisc}  \let\sc\scshape \let\bf\bfseries \let\it\itfamily  \setlrmarginsandblock{23mm}{23mm}{*} \setulmarginsandblock{23mm}{198mm}{*} \checkandfixthelayout  \begin{document}  \bibliographystyle{plainnat} \setcitestyle{nature} \thispagestyle{empty}  This is a nice\footnote{(That is to say, minimal.)} example.\cite{lenat1976artificial,lenat1984and} Unfortunately, it has some problems.\footnote{From an aesthetic point of view.}  \bibliography{corneli}{}  \end{document}     But if we don't load , then we get this other slightly problematic result:   I guess I can live with the small and over-elevated asterisk.  It looks less bad when it follows a period. Taking a spin off of this question:  in a new direction for 2014.  Taking into account a basic Windows infrastructure:   domain controllers Exchange 2007/2010/2013 Sharepoint SQL File Servers / Print Servers AD Integrated DNS AD authenticated 3rd party devices (let's say 802.1X for networking and maybe some content-filtering, etc.) AD/LDAP authenticated "administrative" functions on IT apps/hardware/etc. perhaps some KMS stuff throw in a CA if you'd like home grown apps 3rd party in-house apps   Now, let's rip it all out and decide we are going to the cloud.  We've contracted to move Exchange/Sharepoint/File Services to Office 365.  SQL will now be hosted as well on  something like Azure.  We've gotten away from the need for AD-DNS and simply run everything via a simple Windows DNS server.  We still need 802.1X and would like SSO if possible to our various cloud apps.  Home grown and 3rd party in-house apps would likely stay, but have the ability to use internal user databases instead of AD authentication  The question is...do we really need Active Directory at all?  Or more to the point, AD on-premise or even hosted via Azure or similar (ADFS) or running ADDS on a hosted VM through Azure or similar.  Could/Should we look to something else like a 3rd party SSO option such as  or similar that can provide SSO functionality even if it is as simple as LastPass or similar for each user?  What kind of legitimate needs does AD fulfill if everything else in the cloud?  Could a MS-centric infrastructure get away with not having AD at all if they move everything that previously relied on AD to SaaS offerings that didn't rely on AD authentication? What is the difference between a homepage link with or without a trailing slash? Can someone help me figure out the big-O for the recurrence relation $T(n) = T(n^{1/2}) + 1$?  I didn't think the master theorem would work since it requires $T(n) = T(n/b)$... to have $b$ as a constant. I was wondering if anyone could shed some light on a method to approach this problem? (not looking for a solution) Dealing with rust on a steel frame How can I dual boot Windows and Ubuntu?