John Overholt is the Curator of Early Modern Books & Manuscripts at Harvard's Houghton Library, and today he brings us the original Venn diagram:
The eponymous diagram of John Venn, born 180 years ago today.
pic.twitter.com/WnHMvVdmZu
— John Overholt (@john_overholt) August 4, 2014
Today's Google Doodle is also honoring Venn in a pretty cool way.