Edward Jenner, an English country doctor, gave the first vaccination against smallpox.
Source
The Talyllyn Railway in Wales became the first railway line in the world to be run solely by volunteers.
Loreen claimed victory for Sweden at the 67th Eurovision Song Contest with her song 'Tattoo.'
We Want Beer! parade was held.
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.
