Life magazine picked Gutenberg's invention of mechanical movable type printing as the most important event of the second millennium.
This animation demonstrates the design and operation of a traditional cinema projector.
This animation demonstrates how a CRT television works.
The animation demonstrates how laser printers work
This animation demonstrates the mechanism and operation of record players.
Paper was invented more than two thousand years ago.
One of the crystalline allotropes of elemental carbon.
Public schools in villages played an important role in education.