With the proper cocktail of chemical nutrients, a cell line fermenting in a cylindrical vat at about 98.6 degrees Fahrenheit can generate millions of cells growing in suspension.

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Engineers put the vehicle's guts in an 11-inch-thick platform that contains the fuel cells, electric motors, brakes, suspension and hydrogen storage.

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In technical terms, raw dough is a stiff suspension of starch granules, gluten proteins and live yeast cells.

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