Salt has been a staple in the human diet since ancient times. It is used in cooking and as a preservative. In addition, salt has been used to treat some medical conditions.
Salt was originally found in the ocean and was used by early humans to preserve food from decay. Salt is also a key component of many other natural processes that take place on earth.
In the past, salt was obtained by evaporating sea water or boiling sea water and then collecting the salt crystals that were left behind.
Source: Salt In History
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