How to go about paying a tutor, waiter, Baal koreh (Torah reader), etc.
ודבר דבר (Dabair Davar): Understanding the Reasons Behind Talking About a Mitzvah on Shabbos;
Bottom Line on Mouse Traps in Cases of Great Need;
putting in and taking out a extra piece of the table; removing rust from a utensil; an adult playing with a child Lego, fixing...