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Bitul and Nullification in Kashrut Law
These sources establish the foundational principles of bitul—the nullification of prohibited food or taste—through quantitative and qualitative standards. The sources explain when a forbidden substance loses legal significance upon mixture with permitted food, including the sixty-to-one ratio and the distinction between absorbed taste and physical substance.
מִין בְּמִינוֹ בְּמַשֶּׁהוּ
Priestly Impurity and Aircraft Over Cemeteries
Sources addressing the laws of priestly impurity from proximity to the dead, including the principles of contact, covering, and intervening space. The sources establish the foundational rules governing when a kohen becomes impure and examine how these principles apply to modern circumstances such as passing over graves.
הַמֵּת מְטַמֵּא בְּמַגָּע וּבְמַשָּׂא וּבְאֹהֶל