Iron was life's 'primeval' metal, say scientists

Every living organism uses tiny quantities of metals to carry out biological functions, including breathing, transcribing DNA, turning food into energy, or any number of essential life processes.

Could alternative meat meet a growing demand?

Inside a UC Davis engineering lab, tiny round pellets swirl in a brown liquid inside a 5-liter glass tank. The tank, a bioreactor, is brewing edible fungi high in protein and designed to look and taste like meat.

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