Bava Basra 19b - 21a

What objects can constitute a barrier that prevents ritual impurity spreading from one house to another through a shared window? • Must one bury a stillborn? • Distancing a mill from a wall owned by a neighbor • When one neighbor takes steps to establish property usage that would curtail his neighbor's usage rights if firmly established by precedent, the Gemara is uncertain if the restrictions already take effect • How Does the Vilna Gaon explain the disagreement between the Rambam and Rosh about how to rule in practice? • Residential zoning protections • Why is the second tithe extraordinary among commandments?