However, while salt can preserve and flavor food, does it ever go bad on its own? On its own, pure salt is a food that never actually expires because it's toxic to most microbes and contains no ...

Katie: Um, I would say that is pure because it's a single element. Miss Fong: You're exactly right, Katie. Helium is a gas made up of a single element. Final one now, salt. Katie: Oh, salt.

Katie: Um, I would say that is pure because it's a single element. Miss Fong: You're exactly right, Katie. Helium is a gas made up of a single element. Final one now, salt. Katie: Oh, salt.