Making a "ROSHIM" (mark) on paper, on a page in a sefer.
Why is squeezing liquids that are absorbed in fruits and other various types of foods not the melacha of BORER?
When a Bee Is Flying Between the Window and the Screen: Am I Allowed to Close the Window?;
Understanding the Concept of Something That Was Attached to the Ground or a Tree Going into Shabbos and Then Became Detached on Shabbos (Muktzeh);