I’m acquainted with a lawyer who is arguably the country’s leading authority on estate planning. Legal theory, scholarship, practice… she’s who the experts call for advice. She’s also extremely fit, ...

A Venn diagram shows the relationship, in a visual way, between groups of different things. They are used in many areas of life to classify items as well as highlighting similarities and differences.

In his book The Mathematical Universe, mathematician William Dunham wrote of John Venn’s namesake legacy, the Venn diagram, “No one in the long history of mathematics ever became better known for less ...