![Rabbi Yona Reiss](https://cdnyutorah.cachefly.net/_images/roshei_yeshiva/yona_reiss.jpg)
- Rabbi Yona Reiss
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Halacha:
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Measuring on Shabbos (Rambam and Rashi vs. Tosfos - עובדא דחול vs. מקח וממכר); R' Moshe on Mercury Thermometers; Hourglass for Games; Measuring Cups
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