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6798 BCE
primitive age
It comes with the Management and Domain Fire By The diferentestribus , which is used not only for the Get warm in cold nights , sinotambién to protect wild animals Moment , paragraph laelaboración Food , which it happened at the time of Homo Erectus , hacemás 500,000 years . -
4098 BCE
Metallurgy
The first metal used by humans was gold which can be in native form , which does not need chemical transformations .