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XKCD
XKCD
03:01
The secret fourth kind is 'we applied a standard theory to their map of every tree and got some suspicious results.'
 
2 hours later…
OakBot
OakBot
05:01
@XKCD XKCD #2977 Explained: In this comic, three types of research are presented. The first is an analysis of an existing theory, the second is a new theory, and the third is not a theory at all, but a survey.

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