They probable determined this way of making bread through accident. This befell due to the fact of truth that the surroundings in which the bread was once being made used to be now not continually smooth and consequently an ideal location for gas-forming micro-organisms to develop. These micro-organisms would contaminate the leftover dough. To make the dough rise, leftover dough from the preceding day used to be used. This has resulted in sourdough bread, which is nonetheless being made in the equal way today.
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