understanding Important Concepts in the Melacha of 'מכה בפטיש' (Final Action);
Is One Allowed to Carry (With an Eruv) a Sweater to Shul for After Shabbos? Taking the Key When You Could Hide It;
Using utensils, items that open and close by folding. (E.g., folding tables, strollers, playpens, folding chairs, etc.)