It’s a tribute to John Venn, the diagram’s creator, born today in 1834. (Incidentally, I disagree with the linked Guardian piece’s assertion that the doctor/prostitute/TSA diagram is problematic. You ...

British mathematician John Venn was born on August 4, 1834, so this Saturday marks the 184th anniversary of his birth in Hull, England. John Venn is most known for creating and introducing the Venn ...