(Boneh-בונה Ep. 60) (#780) How to work with a window that is stuck and won't close; office chair, drop ceiling, covers on fixtures radiators, etc.

the bottom line on staining a cloth or a towel by wiping one's hands on it; wiping one's hands on the same color towel;

(Melting ice.) Other types of necessities (in conjunction with putting frozen liquids and warm areas): child, oneg Shabbos, etc.

halachas of SOSSAIR in construction with a structure (e.g. floor, ceiling, wall, etc.);