Minimum measures for Shabbos-carrying liability: bone, glass, pebbles and stones. Rabbi Yehuda is generally more stringent than his colleagues. On the subject of stones, Zunin inquires about maximum size used for wiping oneself after going to the bathroom. He challenges the answers he receives from the Sages: are we really going to make people measure?? The Sages agreed that we should not. Rav Hisda teaches that human dignity is so great that it overrides certain Shabbos prohibitions in the Torah. Ten things to avoid because they cause hemorrhoids. Rabba didn’t want to bother learning this stuff from Rav Hisda, preferring to learn profound wisdom elsewhere. His father Rav Huna told him this is CRUCIAL to life and therefore profound Torah! In disputes between Rabbi Yosei and his colleagues Rabbi Meir and Rabbi Yehuda, the law follows Yosei. End Chapter 8.