Our opening quote contended that Venn diagrams are overrated. Even those who agree must admit that they have a curious allure. Take the sets of interesting topics in logic, in geometry and in ...

Roundabouts are becoming an increasingly common feature on U.S. roadways, with over 7,000 in operation nationwide. In Delaware, the Department of Transportation roundabout location map shows there ...

The Geometry of Compasses; or, Problems Resolved by the mere Description of Circles, and "the Use of Coloured Diagrams and Symbols". By Oliver Byrne. (London: Crosby Lockwood and Co., 1877.) ...

The mystery Father and Son hides a safe with a combination to be read thanks to Polybius Square Diagram - this is one of the puzzles from the game Indiana Jones and the Great Circle. The walkthrough ...