Pesachim 46: The Benefit of Discretion, the Principle of "Since" (again), and Deaf Dough

"Deaf dough" - the halakhah that pertains to it, and why it's called "deaf." Plus, the origins of the 18-minute time frame for rising in a walk along the Sea if Galilee. Also: Separating challah from dough that is already impure - can you take it after the dough is baked? Can you slow down leavening with cold water? Do you even need to worry about this dough becoming chametz? Also: "Tovat hana'ah" and more on the reasoning of "since" ("ho'il"), with its implications, in this case, that allow for preparation of food on yom tov (or not, if you don't accept this principle). Plus: Why we have an eruv tavshilin.