added some mposts

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diff --git a/microposts/dns66.org b/microposts/dns66.org
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+#+title: dns66
+#+date: <2022-02-17>
+
+For some reason, the Google public DNS seems to have become a default
+for many programs, including systemd.  After installing Lineage OS, I
+noticed it also used Google public DNS as the default DNS for WiFi.
+To make things even worse, it was not changeable.  I tried several
+ways documented on the web, including changing it in the WiFi setting,
+but none worked.  In the end, I was able to fix it with an app called
+[[https://f-droid.org/en/packages/org.jak_linux.dns66/][DNS66]].  If you face the same problem, give it a try.
diff --git a/microposts/nc-nd.org b/microposts/nc-nd.org
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+#+title: The CC BY-NC-SA license is bad, don't use it 
+#+date: <2022-03-03>
+
+The CC BY-NC-SA license permits remix, but forbids commercial use
+(therefore nonfree).  It is a weird frankenstein that combines
+copyleft with nonfree elements.  As a result, works under this license
+will beget derived works, which will also be nonfree because of the
+ShareAlike (SA).  It is a mistake by Creative Commons, which should
+have not designed any noncommercial licenses, or if it really wanted
+to, made noncommercial an optional clause of NoDerivative (ND)
+licenses.
+
+Please do the public a favour and don't release your work under the
+NC-SA license.  If you really do not want to allow commercial use,
+please use NC-ND instead to avoid nonfree derivatives.
diff --git a/microposts/reading-emacs.org b/microposts/reading-emacs.org
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+#+title: Reading pdf or djvu in Emacs
+#+date: <2022-02-17>
+
+DocView mode is a versitile builtin major mode in emacs, with the
+ability to display pdf, djvu, odt etc.
+
+However, it is not really cut for the job for displaying large pdf or
+djvu.  It can be slow, and may hang emacs when opening large djvu
+files.
+
+If you want to view pdf, [[https://github.com/politza/pdf-tools][pdf-tools]] is a great alternative.  It is much
+faster (I'd say as fast as external pdf viewers like zathura), and
+offers an outline mode style toc navigation.  It also supports fast
+regexp isearch as well as occur.  There's a nice demo which you can
+view with mpv, youtube-dl
+etc. http://www.dailymotion.com/video/x2bc1is_pdf-tools-tourdeforce_tech?forcedQuality%3Dhd720
+
+For djvu, I recommend use the [[https://elpa.gnu.org/packages/djvu.html][djvu mode]] instead.  It does not make
+emacs hang, and allows quick switch between image and text.