Citation needed

The world can be divided in 2 classes: those who understand this XKCD comic and those who don’t.

If you are in the second class and want to move in the first class, you can read the page “Citation needed” on Wikipedia ;)
(credit: the image is from XKCD, an amazing webcomic of romance, sarcasm, math, and language I suggest you to read. Every comic is licensed under a Creative Commons License so that it is legal to reproduce it here, yay!)

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