Is one allowed to wear shoes that have letters, numbers or pictures on the bottom.
pull tab rings attached to orange juice containers, grapefruit juice containers, etc. (Making a nice usable opening on Shabbos.);
(Melting ice.) freezing dry foods; freezing ice pops; automatic ice makers; freezing liquids not to lose taste or not to get spoiled;
How to Handle a Swarm of Insects That Are Bothering a Person, and Using Insecticide in a Room with Insects;