These overlapping circles are known as Venn diagrams and are celebrated Monday in a Google Doodle. Creator John Venn, had he kept breathing to see the world circle for many more years, would have ...

venn diagrams Google Doodle Says Happy Birthday To John Venn, Creator Of The Venn Diagram The man who invented the elegant overlapping circle diagrams would have been 180 today.

An Italian architectural historian thinks Giacomo Andrea de Ferrera, a Renaissance architect and da Vinci friend, drew the man-in-circle diagram first Leonardo da Vinci's drawing of a male figure ...