Discussion of the tension regarding the establishment of eruv techumin - where measuring precisely can turn out to be to your disadvantage. Also, the case of a city on the bank of a river - what is needed to make the eruv when you have a steep drop, and why a partition of 4 amot becomes necessary. Indeed, the drop to the river is significant enough to need more than a symbolic demarcation. Also, the case of the cities of Hamtan and Geder, and why Geder residents could get to Hamtan, but not the reverse. And the several opinions that explain their different techumei Shabbat. Also: The observation that Shabbat is a relaxed time at meals, and the less than complimentary observation that it was a time of drunkenness.