How Frustration Created Calculus

Imagine you’re Leibniz or Newton in 17th century Europe. There are gravity defying Baroque cathedrals fronted by city squares tinkling with fountains. Children snack on candy canes as their servants pressure cook quail and pheasant for supper back at the manor. They might not have ventured out of doors if not for the reassurance of fair weather from the trusty barometer.