Mishnayot! A women who testifies that her husband has died can remarry, but does she get the ketubah money? It's a machloket between Beit Hillel and Beit Shammai, and one that Beit Shammai wins. Also, the 5 women whose testimony is not believed regarding a man's death because they are too likely to have it in for his potential widow. Plus, the difference between a bill of divorce and the testimony to a man's death. Also, a woman remarries on the basis of a witness's testimony and another witness comes and contradicts that testimony - she stays remarried.