דבר דבר (Dabair Davar): Going to Visit a Sick Person on Shabbos. More About תהילים Tehillim and מי שברך Mi Shebeirach;
is one allowed to open a double knot if it was made by mistake on Shabbos?
חסרון כיס Chesron Kis: Moving a Small Heater. The Status of a Fan;