A new mishnah: How far one must distance smelly industries from a town? For example, a tannery. In part, it may depend on which way the wind blows. Which leads into a discussion of where the Shechinah is, and what direction should we pray (hint: it's a machloket). Plus, where to pray if you want wisdom, or, alternatively, wealth. Also, another new mishnah on keeping this distance between a tree and a cistern.