Bread Many artisan bakers produce their own yeast with a growth culture. If kept in the right conditions, it provides leavening for many years. The baker's yeast and sourdough methods follow the same pattern. Water is mixed with flour, salt and the leavening agent. Other additions (spices, herbs, fats, seeds, fruit, etc.) are not needed to bake bread, but are often used. The mixed dough is then allowed to rise one or more times (a longer rising time results in more flavor, so bakers often "punch down" the dough and let it rise again), then loaves are formed, and (after an
Substance theory Substance theory Substance theory, or substance–attribute theory, is an ontological theory about objecthood, positing that a "substance" is distinct from its properties. A "thing-in-itself" is a property-bearer that must be distinguished from the properties it bears. "Substance" is a key concept in ontology and metaphysics, which may be classified into monist, dualist, or pluralist varieties according to how many substances or individuals are said to populate, furnish, or exist in the world. According to monistic views, there is only one substance. Stoicism and Spinoza, for example, hold monistic views, that pneuma or God, respectively, is the one substance in the