It shows two Venn diagrams (Harris loves Venn diagrams, btw) that lays it out in terms that even a cognitively diminished ...

A Venn diagram can show data sets such as preferences in market research. When sets intersect (overlap), the elements in the intersection are members of both sets. When the sets have no elements ...

A Venn diagram captioned: "In a survey of 250 European travelers, 93 have traveled to Africa, 155 have traveled to Asia, and 70 have traveled to both of these continents, as illustrated in the Venn ...