Edward Jenner, an English country doctor, gave the first vaccination against smallpox.
Source
The Netherlands Institute for War Documentation published Anne Frank's complete diary.
The Adventures of Robin Hood, directed by Michael Curtiz, William Keighley, and starring Errol Flynn and Olivia de Havilland, was released.
Delegates started to gather in Philadelphia to draw up the US constitution.
Underground America Day was first observed, which recognizes the approximately 6,000 people who live in some form of underground architecture across North America.
The Talyllyn Railway in Wales became the first railway line in the world to be run solely by volunteers.
