response: Does she bake bread? I know that the Gauls discovered that beer froth made well-leavened bread.
original_response: Does she bake breads?  I love breads baked with beer froth (discovered by the Gauls) because is controlled yeast in the dough.
history: My friend has been sending me pictures of all the baked goods she has made recently. She must be so talented to be a baker!
knowledge: The Gauls are credited with discovering that the addition of beer froth to bread dough made well-leavened bread, marking the use of controlled yeast for bread dough.