Template:Are You Sure/March 26

• ... that mathematician and academic Paul Erdős firmly believed mathematics to be a social activity; and that Erdős lived an itinerant lifestyle for the explicit purpose of writing mathematical papers with other mathematicians?

• ... that physician and engineer John Mudge was the first self-proclaimed civil engineer, and is often regarded as the "father of civil engineering"?

• ... that American captain and mathematician Nathaniel Bowditch was a founder of modern maritime navigation; and that his book The New American Practical Navigator, first published in 1802, was carried on board every commissioned U.S. Naval vessel for some time; and that updated versions continue to be published?