I've figured out what sourdough and bread really are...

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I've been doing a lot of thinking lately, and here's what I've come up with:

Sourdough: A device made from flour and water used for cultivating natural yeast.

Bread: A balloon like device made from usually wheat flour and water used for capturing "yeast farts". 

So based on this definition, bread is a "Yeast Fart Balloon".

Tim

People ask me how yeast works; I tell them that yeasts are single celled plants that eat sugars in dough. Then they burp CO2 and pee alcohol. Crude but true.

Michael