Android Studio – apps not allowed permissions to save files, can’t change either with Eiciel app

I’ve tried what seems to be everything. Changing permissions in the home folder to my user ownership. Installing the manager Eiciel it won’t let me allow any apps to do anything since everything belongs to root! I can’t do anything except via sudo and a terminal.

And I can’t find a way to login to Ubuntu Studio as sudo or any other way to grant permissions. How does one fix this issue?

I tried adding my username user to visudo, it seems to save files now but the permissions app Eiciel still won’t allow me to add permissions for any users to any apps. Geany located in /usr/bin/geany found with: locate -e geany from the root directory. Tips?

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How can I either heat air for a balloon or heat another material to power a machine, without consuming fuel?

I am looking for a means, by RAW or RAI, to generate heat that can be used to provide life for a balloon, or to power mechanisms that could generate lift, while not consuming fuel, so most likely a spell or magic item, but I dont know which ones.

Do stock image owners hide something in the image information (either in pixels or in exif info) to stop theft?

enter image description here

Please see the image. Is watermarked image of Shutterstock.

Now, if you reverse search (not this one) similar images from Shutterstock, in Google, you find high resolution images without watermark that are used by different websites for their designs.

Doubt 1: When you drop a similar image in Google image search, it fills the search text box automatically with a relevant text like this:

enter image description here

Where does this text come from? Is it hidden in pixels or image information? It exists even when you remove all image information and search again.

Doubt 2 (Actual query):

When I find the high resolution image as told above, open in Photoshop and export as new image (it removes all exif information), does Shutterstock still know that the image was actually downloaded from Shutterstock? I mean have they put something hidden in pixels/image itself?

A more simpler version of this question: If I have the image bought from Shutterstock, but I intentionally use the image downloaded from other sources, can Shutterstock identify that I’m not using the actually bought image?

PS: The intention of this question is not to support piracy or theft. I’m just curious. For professional use, we use paid images.

Homebrew not detecting latest Xcode and Command Line Tools and not uninstalling either

I have macOS Mojave version 10.14.5 installed with Xcode version 10.2.1 and Command Line Tools installed using xcode-select --install. All problem started when I tried to install youtube-dl formula on my system by running:

brew install youtube-dl

The output I get is:

Updating Homebrew... Error: Your Xcode (1) is too outdated. Please update to Xcode 9.0 (or delete it). Xcode can be updated from  Error: Your Command Line Tools are too outdated. Update them from Software Update in the App Store. 

Again, if I run xcode-select --install, I get:

xcode-select: error: command line tools are already installed, use "Software Update" to install updates 


xcode-select -v


xcode-select version 2354 

(I do not know what this means) and running:

xcode-select -p



Owing to these issues, I tried to uninstall Homebrew (with a plan to reinstall it afresh) by running the command:

ruby -e "$  (curl -fsSL" 

but it gives the following error:

curl: (7) Failed to connect to port 443: Operation timed out 

Next, I tried to uninstall Homebrew using the unbrew.rb script available at GitHub but it seems not to remove Homebrew. I tried running it with and without sudo. Even after doing this, running brew config returns:

HOMEBREW_VERSION: 1.3.2 ORIGIN: HEAD: 751334a257d81851e68da7ab390982d4e9fdf909 Last commit: 1 year, 10 months ago Core tap ORIGIN: Core tap HEAD: 3fd7a855a1a357654a4a9a455162761841a4809d Core tap last commit: 1 year, 10 months ago HOMEBREW_PREFIX: /usr/local HOMEBREW_REPOSITORY: /usr/local/Homebrew HOMEBREW_CELLAR: /usr/local/Cellar HOMEBREW_BOTTLE_DOMAIN: CPU: quad-core 64-bit broadwell Homebrew Ruby: 2.3.7 => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Clang: N/A Git: 2.20.1 => /Applications/ Perl: /opt/local/bin/perl => /opt/local/bin/perl5.24 Python: /usr/bin/python Ruby: /usr/bin/ruby => /System/Library/Frameworks/Ruby.framework/Versions/2.3/usr/bin/ruby Java: N/A macOS: 10.14.5-x86_64 Xcode: 1 => /Applications/ CLT: N/A X11: N/A MacPorts/Fink: /opt/local/bin/port 

Running brew doctor outputs the following:

Please note that these warnings are just used to help the Homebrew maintainers with debugging if you file an issue. If everything you use Homebrew for is working fine: please don't worry and just ignore them. Thanks!  Warning: Your Command Line Tools are too outdated. Update them from Software Update in the App Store.  Error: Unrecognized Mach-O load command: 0x32 

Is my Homebrew broken by my attempts at uninstalling it? What can I do to repair Homebrew and all these errors in pointing to the right Xcode and command line tools?

Does the Paladin’s Aura of Protection affect only either her or ONE ally in range?

Aura of Protection on PHB p. 85 states:

Starting at 6th level, whenever you or a friendly creature within 10 feet of you must make a saving throw, the creature gains a bonus to the saving throw equal to your Charisma modifier (with a minimum bonus of +1). You must be conscious to grant this bonus.

(Emphasis mine)

This makes me think only one creature gains the benefit, either you or a single ally in range, because:

  • It says “or” instead of “and”
  • It says “a friendly creature” instead of “any friendly creatures”
  • It says “the creature gains” no “the creatures gain”

For example, Aura of Courage states:

Starting at 10th level, you and friendly creatures within 10 feet of you can’t be frightened while you are conscious.

Display PDF slides via project connected to HDMI, controlled from iPad/iPhone, either directly or via MacBook

I frequently give academic conference presentations, using PDF-based slides. Typically, a projector with HDMI input is available. Currently, I usually connect it to my MacBook as mirrored display, and advance the slides from the MacBook keyboard.

It would be nice to be able to run the presentation wirelessly from my iPad/iPhone, so I can walk around freely while still being able to:

  1. Advance the slides,


  2. glance at the slides without turning away from the audience.

Is there any way to achieve this?

Detailed requirements/desirables are spelled out below, but I guess they’re pretty common for conference presenters with Apple devices.

I’ve found several similar questions such as:

  • How to display iPhone/iOS device on Projector?


  • How to show iOS screen on a projector like Steve Jobs did on his keynotes?

but they are all rather old and their answers don’t fit this use-case, as far as I can see.


  • Projector hardware is totally out of my control; all I can rely on is a projector with HDMI input (sometimes VGA on older projectors).

  • Usually there’s a local Wi-Fi network, often eduroam-based, but the details and quality vary. So a solution using Wi-Fi is OK if it works reliably on most Wi-Fi setups (at least including eduroam) without specific configuration, but not if it needs detailed re-configuration depending on the network.

  • Usually there are just a few minutes available to connect and test the setup at the venue before the talk.

  • I don’t want a wired connection from the iPad to any larger-than-pocket-sized device (since the point is to allow free movement).

  • I’d like the iPad to show the current state of the projection (not necessarily exact mirroring, it’s fine if there’s e.g. a keyboard overlay), and to control the projection, i.e. advance/backtrack through slides.

  • The solution must work for PDF-based slides, or at least something that PDFs can easily be converted to. (Working for other formats, e.g. Keynote, would be great but isn’t essential.)

  • Ideally, a solution should allow full use of the projector display whatever its aspect ratio (i.e. if projector is widescreen, widescreen slides shouldn’t get vertically letterboxed down to the iPad screen which in turn gets horizontally letterboxed to the projector).


  • I’m quite happy to buy an adaptor or similar small peripheral, or a paid app, if these provide a good solution.

  • I’m happy to use my MacBook as a go-between.

  • I don’t mind whether the slideshow is run from the iPad (and mirrored to the projector, possibly via MacBook), or run from the MacBook (and mirrored + controlled from the iPad).

  • A solution that works with either an iPhone or an iPad would be ideal; but if it works with just one of these, that’s fine.

  • Frame challenges are welcome!

What I’ve tried so far:

  • AirPlay from iPad to Reflector on the MacBook. Pretty good, with one serious caveat: connection seems to break easily if the Wi-Fi is at all spotty. (Less significantly, since it goes via mirroring the iPad screen, one can’t use full width of widescreen projector.) Good enough to use at venues with very reliable Wi-Fi.

  • Screen sharing from MacBook to iPad, using Mocha VNC. Seems to require specific per-network configuration for connecting to the MacBook, and on the one eduroam network I tried, I couldn’t get it to work. There are multiple ways to set up the VNC connection, though, so perhaps there’s a more robust approach I haven’t found.

  • Bluetooth remote, controlling MacBook directly, not using iPad: mentioning this as an example “frame challenge” solution. Excellent in most ways, but doesn’t display the slides on the portable device.

I have 2 domains on IIS 10 and have installed 2 separate ssls yet I can not access the https version of either domain

I have gone through and requested the CCR and then added the SSL, grabbed the private key and then reinstalled them into IIS then I also added each SSL to be trusted as well in the MMC.

What am I doing wrong?

FindRoot with NIntegrate: either recursion depth exceeded or numerical integration converging too slowly

Trying to numerically solve an equation involving an integral, either the error Recursion depth exceeded appears (when AccuracyGoal->10 or smaller) or the error Numerical integration converging too slowly appears. In the MWE below, the functions involved are smooth, bounded and the solution for the equation is 1 (as confirmed by Plot[{hdif[z], 0}, {z, smin, 2}]), so there should not be difficulty numerically integrating or solving.

How to find a solution to similar equations which cannot be solved by hand analytically?


Clear[smin, smax, h, hdif] smin = -1; h[z_] := Exp[-z/2] hdif[zmax_?NumericQ] :=   NIntegrate[(Exp[z] - 1)*h[z], {z, smin, zmax}, AccuracyGoal -> 5] smax = FindRoot[{hdif[smax] == 0}, {smax, 0, smin, Max[-smin, 1000]}] 

Other solutions recommend increasing AccuracyGoal or WorkingPrecision (both of which I tried), cancelling periodic oscillations, integrating piecewise around points where the derivative is discontinuous (these do not apply to the function in question). Replacing NIntegrate with Integrate works for h[z_] := Exp[-z/2], but not for functions without a closed form integral.