understanding the concept of "אין צובע באוכלין" (no coloring by food that's eaten)
Cutting Dental Floss; Questions Which Come Up with Toilet Paper; Opening Small Packets of Sugar, Ketchup, Salt, etc.
Understanding the Concept of פסיק רישיה (P'sik Reisha): When an Allowed Action Causes a Forbidden Result with Two דרבנן. When Is One Allowed to...