(Boneh-בונה Ep. 10) (#730) Working with items that are made to go in and out on a constant basis.

Is One Allowed to Step on Any Type of Liquids Released While Coughing or Sneezing (e.g., Saliva, etc.)?;

floor Drain with Hinges or Handle, Shelf in a Bookcase with Hinges, and the Use of a High Riser or Sofa Bed on Shabbos;

(Melting ice.) the accepted ruling with putting ice or frozen drinks into a warm area; defrosting dry foods in a warm area;