How long does a knot have to be tied to be considered a "קשר של קימא". (Knot of permanence).
some more important details about various different types of food boxes;
(Squeezing materials.) quick review of wiping up spills on Shabbos;
making boxes (e.g., cardboard birthday cake box, cookie box, etc.). Putting a mattress on a bed. Using liquid soap that becomes foam;