Understanding the Difference Between טירחא יתירה (Tircha Yeseira, Major Exertion) and טירחא סתם (Tircha Stam, Minor Exertion) on Shabbos;
How to Work with Watches on Shabbos. Part #2;
The Object Being Torn Has to Be Something Usable, Not Attached to the Ground; More Information About Small Packets (e.g., Sugar, Coffee, etc.);