More on the Mishkan, but more concrete: the colorful curtains, made of goat hair. Spinning goat hair required exceptional taken or skin, especially because they did the spinning on the animal. Especially when you consider the wayward, stubborn nature of sheep or goats... Also: back to private/public domains, when one throws above 10 tefachim (air space that isn't in the domain) to land on top of a 10 tefachim. But here, R. Moredechai has a complaint that Chazal do not address his question thoroughly enough - which speak to a culture of learning that includes challenging others' take. Plus: Changing the status of a karmelit (to reshut hayachid)...on Shabbat - can that change if status make you obligated (or exempt) in the korban chatat... a real conundrum. And: don't sit in a chair all shabbat, lest you incur an obligation for a korban; rather, live your life and learn the halakhah!