Shekalim 4: Who Counts?

On the mitzvah of machatzit ha-shekel... women and slaves and minors are not obligated to provide it, but they can donate if they want to - while non-Jews' donations in this category would not be accepted. Also, paying a premium on top of the machatzit ha-shekel: who pays, who doesn't have to? Plus: the dispute between R. Yochanan and Resh Lakish and R. Meir's approach regarding paying 2 machatzit ha-shekels, and the story of God forging the coin. Plus, on the Kuti, as a population that does not contribute to the census. But this is a real dispute, whether they are in the count or can't be.