How long does a knot have to be tied to be considered a "קשר של קימא". (Knot of permanence).
Cases when food, drinks, wax, etc. fell in an area where there is NO letters, numbers, pictures.
דבר דבר (Dabair Davar): Addition 2 to 1538: Requests in Davening on Shabbos;
how to work with destroying a temporary ohel. Removing broken glass from a broken window. Removing a piece of outside stairs that's broken;