According to Wikipedia, a Venn diagram is a diagram that shows possible logical relations between a finite collection of different sets." History buffs will further be fascinated to know that Venn diagrams were introduced in 1880 by John Venn in a paper entitled
On the Diagrammatic and Mechanical Representation of Propositions and Reasonings in the "Philosophical Magazine and Journal of Science", about the different ways to represent propositions by diagrams.
The author takes his role in applying such concepts in science and graphical representation to this blog very seriously.
So here, according to Facebook, I believe (not my scene), is the genesis of an orthopaedic surgeon...
Makes sense to me.
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