Practical applications with "מצוה" in S'char shabbos.
An Interesting Situation That Sometimes Arises Regarding the Melacha of Tzod (Trapping);
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.);
The halachas of opening food packages with letters, numbers, pictures.