(Melting ice.)
Addition to 1618: חסרון כיס Chesron Kis: Matzah for the Seder;
Is There a Problem with Spreading Foods (e.g., Peanut Butter, Cheese, Hummus, etc.) onto Challah, Matzah, etc. on Shabbos?;
Understanding the Severity of a מלאכה שאין צריכה לגופה;