Defining Israel's topography based on what grows where. Also, more on different practices in different places. Beginning with commerce between Jews and non-Jews, in the context of animals - more taboo than we might have thought. And back to Pesach practice - whether you intentionally eat roasted meat on seder night, or intentionally do not. Plus: Making sure not to specify that your meat is for Pesach, lest it seem like designating consecrated meat for Pesach. Also: Theodosius of Rome, and his practice of designating roasted meat for seder night. The sages rebuke him, saying - were he not himself, they would excommunicate him for (appearing to be making) offerings outside of the Temple. So who was he (Who's Who) - in terms of his character (which the Gemara answers, somewhat implicitly) and the historical backdrop (which is less clear). Plus: Lighting candles for Yom Kippur night, or intentionally not lighting candles.