the difference between england the uk great britian and the british isles. Ah finally!!! An explanation!
Euler diagram - Wikipedia, the free encyclopedia
Venn diagrams morphing into Euler circles.
Euler Diagrams Overview
File:British Isles Euler diagram 15.svg
This is a Euler Diagram of the present state of American politics. Please note: Mitt Romney seems to be "all over the map" here.
Euler diagrams . . . see for their use in diagramming syllogisms and for info on Venn diagrams.