More on the methodology of halakhic decisions, via a case of ritual impurity and the possibility thereof for carding combs for flax and wool. And the implications of unattributed mishnayot. Also, betrothal within the 3 months, plus a whole lot of cases of how people would wait or not wait for the 3 months. Plus, the implications of a waiting period for those who are in the 30-day mourning period for a spouse - as drawn from the parallel with Tisha B'Av, and the sense of personal mourning that should apply in both settings.