At some stage in the Neolithic era people had learned that if, instead of using ordinary grain, they used grain that had been sprouted and then dried, it made a bread that kept unusually well. The Egyptian process was to sprout the grain, dry it , crush it, mix it to a dough and partially bake it.The loaves were then broken up and put to soak in water, where they were allowed to ferment for about a day before the liquor was strained off and considered ready for drinking." ---Food in History, Reay Tannahill [Three Rivers Press: New York] 1988 (p.48) "Leavening, according to one theory, was discovered when some yeast spores--the air is full of them, especially in a bakehouse that is also a brewery--drifted onto a dough that had been set aside for a while before baking; the dough would rise, not very much, perhaps, but enough to make the bread lighter and more appetizing than usual, and afterwards, as so often in the ancient world, inquiring minds set about the task of reproducing deliberately a process that had been discovered by accident.
619-620) "It seems that the discovery of ale was stimulated by the process of bread-making.
A fire is kindled in the bottom and the dough is slapped against the hot interior walls, yielding curved disks of bread.
Many other sorts of oven have been discovered in Israeli excavations.
For six thousand years and more it is the oven, however crude or complex, which has transformed the sticky wet dough into bread.
It is the oven which influences the final character of the loaf; the effieciencycy of an oven, or lack of it, can determine the success or failure of any bread baker's business. It was the Egyptians who first used a manufactured portable oven.