How long does a knot have to be tied to be considered a "קשר של קימא". (Knot of permanence).
Introduction to Straining a Liquid That Is Drinkable by the Average Person;
Some Final Thoughts on the Melacha;
Folding Garments on Shabbos, קיפול בגדים (Kipul Begadim). How הכנה (Hachana) Has to Do With Folding Garments on Shabbos;