The decree against full showers or baths on Shabbat, even when the water has been heated prior to Shabbat. Plus: the hierarchy of rabbinic authority, in which " Tannaim trump Amoraim. Two caveats from Anne: 1) when I said 3 days of yom tov in "America," I did not intend to exclude the rest of the Diaspora!; 2) in the discussion of long-haired bathing, yes, I'm well aware that there are women with short hair and men with long hair. Also: Who's Who: Rabbah.