Various interesting cases in conjunction with weighing on Shabbos.
The Concept of Trapping a Slow-moving Creature (e.g., Turtle, Caterpillar);
Removing a Scab from One's Skin, Pulling Out a Non-bleeding Tooth, and Removing Warts, Pimples, etc. with a Utensil;
How to Work with a Non-Jew in All These Various Different Circumstances;