Writing with something permanent on a material that is permanent.
How High off the Ground Are We Talking About When We Say One Cannot Make Use of a Tree? Shaking a Very Thin Tree...
how to work with paper towels, napkins, tissues, toilet paper on Shabbos;
Is There a Way to Strain Out a Drink That Is אסור מדרבנן (Asur M'drabanan/Rabbinically Not Allowed)?;