Understanding When One May Bite Off or Pull Off Part of Their Nail. What Should One Do When Needing to Remove Dead Skin?;
floor Drain with Hinges or Handle, Shelf in a Bookcase with Hinges, and the Use of a High Riser or Sofa Bed on Shabbos;
Understanding the concept of "שכר שבת בהבלעה" (shabbos earnings included with weekday earnings).