During World War II, Fleischmann's developed a granulated active dry yeast, which did not require refrigeration, had a longer shelf life than fresh yeast and that rose twice as fast.

During World War II, Fleischmann's developed a granulated active dry yeast for the United States armed forces, which did not require refrigeration and had a longer shelf life and better temperature tolerance than fresh yeast ; it is still the standard yeast for US military recipes.

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