Understanding the concept of separating "pesoles" (bad) from "pesoles"(bad).
Ex. Separating recycling from the rest.
Opening and Closing the Door of a Bird Cage on Shabbos;
Administering an Injection on Shabbos and Setting Up an IV Line;
Blowing Dust Off an Item (e.g., a Shelf, Sefer). Part 2: Spitting into the Air;