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-1

Rav Moshe Feinstein, z"l, rules (Igroth Moshe YD 3:52) that a pregnancy test ("בדיקות הידועות לרופאים") can be relied upon to assume halachically that a woman is pregnant (with regard to whether she would need to continue to keep w'sathoth). It would seem to logically follow that, provided the results of the ultrasound were as reliable as such a pregnancy ...


0

On the simplest level, if you must expose yourself to physical danger by going out on Shabbat when it is dangerous from ice and snow, you would have a heter in terms of 'sakanah nefashot', danger to life. The questions of binyan and making a mark are not relevant. There is no creation of a toothed edge. It exists both before and after placing the YakTrak on ...


1

Look in the Mishna Brura. He explicitly says אבל כשיש שם חלודה יש לחוש שמא יש שם משהו מן החמץ והחלודה מכסהו ולזה לא מהני הגעלה כי אין הגעלה למה שהוא בעין. וכ"ז בחלודה שיש בזה קצת ממשות (שקורין ראס"ט) שכשגוררין אותה משם יש שם כמה עפרורין שאז יש לחוש שמא יש תחתיה משהו ממשות האיסור בעין והחלודה מכסהו אבל אם אין בחלודה ממשות כלל רק מראה בלבד כמו שנמצא ...


-1

You could ask the same question concerning tarnished silver which has a thin layer of silver oxide on its surface. There is no chiyuv to polish silver before you tovel it because you do not perceive the tarnishing as something seperate to the kli. The same would seem to apply to anodized metal.


8

When you purchase a DVD like you are describing, there is a 'terms of use' agreement, a 'terms and conditions' of sale and multiple copyrights (often in compliance with different jurisdictions around the globe). They all must be agreed to in order to purchase the product legally. There are also follow up warnings of those agreements and conditions that come ...


4

As you said, this is a very interesting field where there aren't many organized halachot (though this is improving with time). Anyway, here is an interesting summary of halachot for this issue, with many sources. See especially section 2.9, about a person who purchased a CD, and wants to make a copy of it for personal use (e.g. backup). Even though this is ...


2

The Avnei Yashfei 30:5 writes that using a faucet does not count as using a kli since it is connected(to pipes) to the the house and has a din of being attached and cannot be considered a kli(utensil). So even turning the faucet on and off with your hands wouldn't help. Rav Eliyashiv holds this way as well and is also quoted in Ashrei Ha'Ish(Chelek 1:pg.203 ...


2

I've asked R. Ari Hart (Hebrew Institude of Riverdale) for guidance in this matter, so I will share here what he told me in the hopes it helps you answer your question. Devices like these measure the steps you take, and measuring is prohibited on Shabbos. However, since you're not measuring, you let the computer do it, it may be OK. It would be better if ...



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