Fingerprints; invisible ink; writing on one skin; x-rays.
Is One Allowed to Press the Button on a Fan to Control the Oscillating (Turning Back and Forth) Cycle on Shabbos? Using Water Vaporizers...
Food, drink, wax, etc. What to do when fell on wording. (Sefer, bencher, etc.)
fliptop, snap top caps, e.g. ketchup bottles, salad dressing bottles, etc.