Douglas Engelbart invents the first computer mouse, which isn’t used with home computers until 20 years later.
Engelbart also develops a pre-Internet system to use hypertext to link files together for sharing. The mouse helps navigate that system.
The first mouse was made of wood and featured two metal wheels.
3M develops a plastic Fresnel lens for overhead light projectors.
Previous lenses were made of heavy glass.
The Fresnel lens was originally developed by French physicist Augustin-Jean Fresnel for use in lighthouses.