General What are QR codes? Quick response (QR) codes are two-dimensional bar codes that can be read by specialised apps on smartphones and tablets or by separate code readers. QR codes are square pixel maps, that can...
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General
General 
General When I read, I like to collect quotes, tips, and other interesting snippets that could be important and useful to me, but since they have been only in my notebook, I don’t re-read them very often....
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