I recently visited Juneau, Alaska. It is a small city of 35,000. The city limits are quite large, however -- 3,225 square miles -- but much of this area is separated from downtown Juneau on Douglas ...
Inspired by Is Juneau, Alaska -- surrounded by natural barriers -- a natural eruv Is there a maximum square mile or square kilometer area that may be enclosed by an Eruv? (sources)
Inspired by Matzah eruvin on erev Pesach Can egg Matzo be used to make an Eruv Chatzeiros on Pesach? On Pesach, Ashkenazim do not eat egg Matzo; however, it is not Chometz. In certain instances it ...
In halacha certain things are considered invalid because the exceed the maximum height which people will notice, 20 amos (menorah, sukkah, korah). In modern times many (most?) people live in areas ...
Eruv chatzeirois: I.e. 2 buildings with the same owner, and all Jews want to carry into the common (for both buildings) enclosed courtyard on Shabos There are also non-Jewish tenants Is it enough ...