I go through the math here. Admittedly I use a lot of very rough estimation. I caught some mistakes in my math in the video which I have edited here, as well as adding a section below regarding the contents of the Aron.
It's important to note that according to R' Meir, the amos used are 6 tefachim each, while according to R' Yehudah, the amos used are 5 ...
While the Rosh (Makkot 3:2) rules that the prohibition of cutting the peyot applies even to cutting them short with a scissors, the Rambam (Avoda Zara 12:6) rules that the prohibition is equivalent to that of the shaving the beard which is only prohibited with a razor.
The Shulchan Aruch (YD 181:3) rules:
אינו חייב אלא בתער. ויש אוסרים במספרים כעין תער, ...
In terms of using a #1 guard:
The Rambam (Hilchos Parah Adumah 1:4) rules that a completely red cow that has two white or black hairs would not have the status of a Parah Adumah. If however, the hairs are so short that one would not be able to grab them with tweezers the hair is considered to not be there at all. Apparently the Rambam has another ...
While the Kol Bo (Siman 24) writes that such a small amount would not need a Beracha Rishona, and Rabbeinu Yonah (Brachot 27Rb) writes that for such small amounts every food gets the Beracha Rishona of "SheHaKol", the vast majority of Rishonim and all Acharonim rule that even the smallest amount ("כל שהוא") of food needs its regular Beracha Rishona and there ...
I have heard the same rumour. I found the following by Rav Aviner. He was asked that whether the Kiddush cup of the Chafetz Chaim was like the measurement of Ha-Rav Chaim Naeh and not like that of the Chazon Ish.
His answer was
This is brought by Ha-Rav Moshe Karp as testified by the Chafetz
Chaim's grandson, Ha-Rav Hillel Zacks, the Rav of the ...
Yam Shel Shlomo in chapter 4 of Bava Kamma says to pronounce it beya as the other word is not nice.
This is subsequently brought in the Magen Avraham in siman 156 which is probably where it picked up it's popularity.
Tiferes Yisroel in the beginning of the masechta named after the word in question, writes that he can't understand who wouldn't like the ...
R' Chaim Na'eh in his Shiurey Torah (3:42) calculated the weight of a Talmudic era peruta coin as 1/40th of a gram of silver (25mg). According to WolframAlpha this is worth 0.02 USD at the time of posting. However, this may not be the contemporory understanding of "shaveh perutah" in Halacha.
The 18 minute mark is almost certainly a mistake. The source of this time limit is from Pesaḥim 46a:
Mishna: [Regarding] ‘deaf’ dough, if there is [a dough] similar to it
which has become leaven, it is forbidden. Gemara: What if there is
no [dough] similar to it?―Said R. Abbahu in the name of R. Shimon b. Lakish: [The period for dough to become ...
This might simply have been a confusion of units. Sizes.com claims that a Russian verst is equal to 500 sazheni, but a Moscovy verst is 1000 sazheni. The sazhen was fixed at 7 English feet (2.134m) in both systems way back during the 1700s in Peter the Great's rule.
In 397:1, the Aruch HaShulchan says that specifically, he is talking about the Russian ...
They used a half of a lug of oil in each candle every night, in order that it would last through the longest night of the year (Menachos 88b). A lug is 6 egg volumes. An egg volume is disputed, but it's accepted to be either around 57 (R' Chaim Naeh) or 100 (Chazon Ish) mL.
So the volume per candle was about 172 or 294 mL, or about 1200 or 2050 mL total.
I'd say if an average human, using an average human brain and eye, can't figure out the pattern, that's good enough.
Rabbi Asher Weiss discusses the criteria of "does an unaided human notice it?" with regards to triggering some change deep instead some semiconductor someplace that I'd never notice. He points out that I may not drag a heavy bench on shabbos ...
With regards to your first question, there is an opinion quoted in Sefer Habatim (Mitzvah 224) that holds that poison was actually added to the water and the miracle was not regarding the guilty sotah, but rather a miracle for an innocent sotah. According to this opinion, the fact that the first sister drank and nothing happened was miraculous since she was ...
Taken from an article by Rabbi Aryeh Lebowitz:
The Rambam (Avoda Zara 12:6) rules that one is only prohibited from removing peyos with a razor. Cutting peyos off with a scissor that provides a cut as short as a razor is completely acceptable. (The Darchei Teshuva (181:2) writes, based on the Sefer Hachinuch, that one is merely exempt from punishment, but ...
Miut Hamatui has four opinions as brought down in the new Yalkut Yosef.
1) Rav Shelomo Zalman Aurbach who holds it is around 10%.
2) Shevet HaLevi who holds it is even less but doesn't specify.
3) Rav Bension Aba Shaul who says around 17%.
4) The opinion of the Rivash and Hacham Yishak Yosef Shelit"a who hold that it is much closer to 50% but doesn't ...
The Talmud states that this is to correspond to the three-fold division of Torah, Neviim, and Ketuvim:
הני ג' פסוקין כנגד מי אמר רב אסי כנגד תורה נביאים וכתובים
What do these three verses represent? — R. Assi said: The Pentateuch, the Prophets,
and the Hagiographa. (Soncino translation)
Most of the Codes simply cite the rule without mentioning ...
The Chamudei Daniel has the famous opinion that for things that the Shulchan Aruch says "it becomes not kosher immediately", that means "if you don't pull them out immediately." More like a 2-second rule or so.
I found the following teshuvah by R. Betzalel Stern, BeTzel HaChochmah 2:16:
Regarding someone who travels by airplane from Australia to Israel,
and on the way flies over mountains and deserts...In my humble
opinion, it seems obvious that as long as he has a clear view, even
though he only sees them from a plane flying miles above, he is
Baer Heitev to Shulchan Aruch, Orach Chaim 210:1 writes:
מכזית. כל האוכלין מצטרפין לכזית אכל חצי זית מז' המינין וחצי זית אחר
מברך אחריהן בנ''ר.
All foods combine for a "כזית," (therefore if) one ate half a זית from
the ז' מינים, and half a זית from something else, he makes a בורא
This above case would be exactly your case -- ...
Because it was intended for a mitzvah I'd rather use it for a mitzvah if there is such an option.
I've never heard of such a thing, as far as I recall. I've heard that it's nice to reuse something for a mitzva if it was used for a mitzva, but not if it was merely intended for such use.
But no matter: that's what you want, that's what I'll address.
The Shevet Hakehasi 5:115:4 brings that the Chida (Machzik Bracha) was bothered by this postion of the Seder Hayom. The Shevet Hakehasi explains that this postion of the Seder Hayom can be reconciled by an explantion he gave in his 2nd chelek siman 230 . He writes there that the base and the legs of the menorah need to be less than 10 tefachim. However ,the ...
The Talmud says on Menachot 28b:
אמר שמואל משמיה דסבא
גובהה של מנורה שמנה עשר טפחים
הרגלים והפרח ג' טפחים וטפחיים חלק וטפח שבו גביע וכפתור ופרח וטפחיים חלק וטפח כפתור ושני קנים יוצאין ממנו אחד אילך ואחד אילך ונמשכין ועולין כנגד גובהה של מנורה וטפח חלק וטפח כפתור ושני קנים יוצאין ממנו אחד אילך ואחד אילך נמשכין ועולין כנגד גובהה של מנורה וטפח חלק וטפח כפתור ...
The Gemara in Eruvin 43b discusses how R. Gamliel was able to measure the distance. The Gemara says that R. Gamliel had a hollow tube with which he was able to look and sight a distance of 2000 Amos. Per Rashi a long hollow tube narrows and shortens the viewer's range. The length of the tube can be calibrated to yield a maximum sighting distance of 2000 Amos....
Many poskim put it at 10% -- thank you Fred, Mishkenos Yaakov 1:YD17 first puts it that way. (See Rabbi JD Bleich's "Is the Milk We Drink Kosher?" in Tradition). This is the general OU opinion.
We find the figure of 10% by combining a law in Terumot -- about whether you must check that a bottle of wine in the case has spoiled before taking terumah from the ...
The Shulchan Aruch rules (YD 325:1 based on Mishna Challah 2:4)
שתי עיסות שאין בשום אחת כשיעור, אם נוגעות זו בזו עד שנדבקים מעט זו בזו, מצטרפים
Two doughs [of the same type] of which neither has the requisite amount [but together they would], if they touch each other such that they stick to each other a little bit, they combine [to form the minimum ...
According to the site projectsbyjen.org, the dimensions of an Oreo are 1.75 inches in width, and .314 inches in height. Since there's, surprisingly, not a lot of easy to find info on Oreo dimensions, let's go with this.
A k'zayis (according to berachot.org, quoting Rav Bodner's "Halachos of K'zayis") is 28.8 cm³ (the most stringent view (I think), equal to ...
הבכורים אין להם שיעור מן התורה אבל מדבריהם צריך להפריש אחד מששים והרוצה לעשות כל שדהו בכורים עושהו:
The Bikkurim have no measurement from the Torah, but [the rabbis] required separating one sixtieth; and if one wants to make his entire field Bikkurim, he may.
Rambam Bikkurim 2:16
Sukka 17a Mishnah:
הרחיק את הסיכוך מן הדפנות שלשה טפחים פסולה בית שנפחת וסיכך על גביו אם יש מן הכותל לסיכוך ארבע אמות פסולה
If the s'chach is distanced more than 3 handsbreadths from the walls then it is invalid. If the roof caved, and you put schach into the breach, if there are more than 4 cubits from the wall then it is invalid.
If there is airspace, ...