When was salt discovered?

Answer 1

Nobody knows for sure.

Salt was used by humans long before history was written.

About 8000 years ago, people in China and eastern Europe harvested salt by boiling water from lakes and springs. This was the earliest known salt harvesting.

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Answer 2

Luna Chen

Salt has been known to humans since prehistoric times, and there isn't a specific date for its discovery. Its use dates back to at least 6000 B.C., as evidenced by an ancient salt production facility found in Romania. Salt has played a crucial role in human civilization for seasoning, preserving food, and in various cultural and religious practices.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.