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Название: The Periodic Table (Essential Chemistry)
Автор: Ham B.
In 1977, two space probes lifted off from Earth on a mission to the outer reaches of the solar system. Voyager 1 and 2 each carried a unique item among the usual scientific instruments: a golden record filled with pictures, sounds, songs, and languages from around the world. The record was made of gold wrapped around a disc of copper, since recordings made on metal plates last longer and remain clearer than recordings made on ordinary plastic. The record, packaged with a needle and a power source to act as a basic record player, was designed to last for millions of years in outerspace