How long does a knot have to be tied to be considered a "קשר של קימא". (Knot of permanence).
wiping one's hands or mouth on a towel when they are dirty from colored foods or drinks (e.g., grape juice, pomegranates, colored ices, etc.);
What makes " שכר שבת בהבלעה" (shabbos earnings included with weekday earnings) different from regular "shabbos earnings".