Practical applications with "מצוה" in S'char shabbos.
(Squeezing materials.) understanding the concept of squeezing out human hair, toothbrushes, baby bottle, etc.;
Does the Melacha of Gozez Apply to Feathers on Cooked Chicken?;
מחמת חסרון כיס Machmas Chesron Kis: A Mezuzah;