Introduction to the melacha of "DOSH".
Is One Allowed to Salt Vegetables When They Are Sliced or Peeled?;
Cases when food, drinks, wax, etc. fell in an area where there is NO letters, numbers, pictures.
Introduction to the Concept of עובדא דחול (Uvda d'Chol) in Relation to the Melacha of M'AMER;