Salt, Part 1 & 2 (Listen)

Something insignificant is sometimes said to be worth "a pinch of salt." On the other hand, people of impeccable integrity are often called, "the salt of the earth." Salt is now among the most common substances on earth, although once it was rarer and more valuable than gold. Paul Kennedy considers the incredible history, science and mythology of salt.

Listen to Part One

Listen to Part Two

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