Edward Jenner, an English country doctor, gave the first vaccination against smallpox.
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The Talyllyn Railway in Wales became the first railway line in the world to be run solely by volunteers.
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 USA's first space station, Skylab, was launched into Earth's orbit.
The Netherlands Institute for War Documentation published Anne Frank's complete diary.
The rockumentary film featuring The Who titled 'Kids Are All Right' premiered at the Cannes Film Festival.
