On Sunday, Jews are observing Rosh Hodesh Adar, the beginning of the Hebrew month of Adar. During Adar, we celebrate Purim, a boisterous holiday marking the saving of the ancient Persian Jewish community from near-extermination. In anticipation of the holiday, the sage Rav taught, “When Adar begins, we increase joy.” (Babylonian Talmud, Ta’anit 29a). Similar to how Christmas decorations start going up...