Fingerprints; invisible ink; writing on one skin; x-rays.
the use of colored toilet disinfectants, colored deodorizers on Shabbos;
The Concept of Trapping a Slow-moving Creature (e.g., Turtle, Caterpillar);
Understanding the Concept of Derech Achila (Usual Way of Eating) as It Relates to the Melacha of Meraked. What Is the Proper Procedure for...