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The ארחות שבת (by Rav Yosef Gelber and Rav Mordechai Rubin) in Vol. 2 on page 294 in Siman 20:154 discusses this. They write that one may wear a retainer - פלטה ליישור שינים - on Shabbat. In the footnotes they explain that since the "medical" action [of moving the teeth] is not apparent, but takes a long time, therefore it's permissible. Same logic should ...


4

Living as I do on the edge of the Amazon Rainforest, I feel rather well qualified to answer this question. A coconut shell is indeed חותלות - just as we can't eat an orange without peeling it, we can't drink the coconut water or get at the coconut meat without smashing the coconut shell open. That said, how are you doing that? In my home, a machete is a ...


3

Meiri to Shabbat 104b: If one writes a single letter and thus completes a book, or weaves a single thread and thus completes a garment, one is liable, because any act which completes something is important, and is considered as if it were two [letters] and he is liable for writing. The Sages of the generations have asked well: Why is he not also ...


2

Objects in this category are called "keilim she'm'lachtam l’issur," which means--according to this nice overview of Shabbos 123-124--they may be moved if and only if one needs them (l'tzorech gufo) or the place they are occupying (l'tzorech mikomo) for a Shabbos-approved use. (Cf. "keilim she'm'lachtam l'heter," which refers to items that may additionally be ...


2

I found the Rivevos Ephraim 3:206 who addresses this issue. He says that in a Reshus harabim it is forbidden. He also mentions we don't ride bikes and this is similar. He references Shmiras shabbas khilchita 15:13. He ends off saying that his wife claims that it should be forbidden because of digging up dirt and uprooting grass. He says that even if there ...


1

The goal of the laundry process is to maintain the cleanliness and whiteness of the garment. Softening the linen shirt is not considered an integral part of the laundry process. Thus, the softening does not finish the process of making the garment, nor does it finish the laundering process. Regarding a Sudar, the Gemara states that there is an Isur in ...


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