I understand that, as per the halakha, a Jew is absolutely obligated to save the life of a non-Jew, even if doing so requires of him that he desecrate Shabbat. (See, for example, this answer.) My ...
The mishna in Shabbos 4(1) tells us which materials may not be used to insulate foods for Shabbos because they "add heat". One of these materials is salt. Can anyone explain how salt can add heat ...
In the Siddur, Pirkei Avos has a different division (in each Perek the amount of Mishnayos) than in the Mishnayos Avos. Who determined the division of the Mishnayos in the Siddur?