Salt has been one of the most valued substances in human history. Before mod refrigerators exi, people depe on sa to ke meat a fish fr spoiling dur long win and dang journeys. Because salt was so useful, it was traded across great distances, and in some places it was even used as a form of payment. Several ancient roads were built mainly to transport it. Today, salt is cheap and easy to find, but it remains essential in cooking and in many industries.

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