17

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 ...


15

Most of the other answers seem to be working under the assumption that the OP is basing the question on the prohibition against consuming blood (although this motivation is not stated in the question). Taking the question at its face value, however, the OP just wants to know how well meat needs to be cooked in order to be Kosher. As YDK's answer suggests (...


12

The source for all the melachos comes from the actions done to build (or operate) the Mishkan. Writing was used to make symbols on the boards that made up the outer walls. They were used so that when the Mishkan was disassembled and reassembled they would know which boards went where. Two letters (one on each board) were used to mark which boards matched ...


12

Piskei Teshuvos (227:2) cites Bircas HaBayis who says that the blessing can only be recited during the quake or within 2-3 seconds (תוך כדי דיבור) after it's over. He also says (from Teshuvos Shevet HaKehasi) that even mild quakes warrant this blessing, and (from Shaarei Teshuvah in the name of Maharam Chaviv) that if another quake occurs even that same day,...


12

There was a small amah (5 tefachim/amah) medium amah (6 tefachim/amah) 2 large amahs (6t/a + half a finger-breath & 6t/a + a whole finger) According to R. Yehudah, the temple building was measured by the 6t/amah and the vessels are all measured by the 5t/amah. According to R. Meir, the 6 tefach amah was used everywhere except the gold alter, and ...


12

The Talmud searches for Beit Shammai's reason on Kiddushin 11a. The first suggestion, that of Rav Zera, is that an average woman thinks she is important enough to not accept anything less an dinar for kiddushin. The gemara asks, according to this, it should be completely subjective based on the individual girl. The answer is that this rule applies in a case ...


11

Shulchan Aruch Orach Chaim 27:11 says that the straps should be at least the width of a grain of barley. The Halacha Berura says that this amounts to 1 cm, or 2/5th of an inch, but one should preferably ensure that the Tefillin be at least 1.1 cm, or .44 inches, wide.


11

The Mazal Sha'ah on the Rambam infers that the shi'ur l'chayyev for anointing with t'rumah oil is a k'zayis, based on R' Yehudah's opinion in the gemara (K'risus 6b) who holds that a person is liable for a k'zayis of prohibited anointing with the shemen hamishchah (Commentary to Mishneh Torah, Hil. T'rumos 10:2). (One should note that it is still Biblically ...


11

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 ...


10

From the Tur (Orach Chaim 46): It is from a braisa based on pesukim. According to Natronai gaon, David haMelech set it into halacha to stop the deaths of 100 Jews daily where the spiritual cause of there death was unknown until "he delved and understood with ruach hakodesh and fixed" the 100 brachos. So, it an obligation and is brought so in the Shulchan ...


10

The Gemara in Pesachim 46a (brought in the Rambam Laws of Chametz 5:13 and the Shulchan Aruch OC 459:2) says that if one leaves dough for the length of time that it takes to walk 1 "mil" (a Talmudic unit of distance) then it becomes Chametz. Opinions regarding the time it takes to walk a mil vary from 18-24 minutes, and here we are strict to take the shorter ...


10

Rashi to that verse, and Tosafos in Bechoros 5a (s.v. Esrim), ask this question. They answer (based on the Targum of the verse) that there were actually separate measuring utensils that had to be made in the listed denominations. See there for the detailed explanation of what each one was used for. Update: Here is how it is presented by D.A.F. Resources: ...


10

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 ...


9

Some base the Kadish for the soul on the date of death. Others say it goes from the date of the burial (See Pnei Baruch 34:9). The amount of time a soul should have the kadish is the 12 months of geihinom. The minhag is to retract this to 11 months so that it doesn't appear as if the son is assuming his parent needed geihinom (Rema YD 276:4). I have ...


9

The Mishna Brura in OC 1 says: י"א דלענין זה אמרינן כולא ביתא כד' אמות דמי אבל אין לסמוך ע"ז כ"א בשעת הדחק. "There are those who say that with regard to this (washing hands), we say that the entire house is as 4 amos (cubits), but one should only rely on this when forced." The Aruch HaShulchan in OC 4 says: מפני שיש מחמירים ומזהירים ע"פ הזוהר שאסור לילך ...


9

It was explained to me as a single layer thick enough to peel off in one piece. (See Kaf Hachaim (Sofer) Y"D 91:32- ושיעור כדי קליפה היינו שתהא גסה קצת כדי שתוכל להנטל כולה כאחת)


9

As for your third point, the Aruch HaShulchan (OC 3:10) and the Mishna Berura (OC 3:31) both rule that it is permissible to delay until one can find an appropriate place to relieve oneself. Additionally, the Mishna Berura explicitly includes all other cases of Kavod Habriyot (human dignity) in this exception.


9

Nitei Gavriel Yom Kippur 10:17 says that it should be done with money that equals the value of a chicken.


9

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 ...


9

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 ...


8

Excellent question. Leviticus Ch. 12 says that it's 7 days if the baby is a boy, and 14 if a girl; (but she has to then immerse in mikvah, a ritual bath). (Then there's a lengthier stretch of time that she can't enter the Temple, but is permitted to her husband.) However: Skip ahead to Leviticus Chapter 15. If a woman has a normal period (15:19) then she ...


8

From Menachos 43b It was taught: R. Meir used to say, A man is bound to say one hundred blessings daily, as it is written, "וְעַתָּה, יִשְׂרָאֵל--מָה יְהוָה אֱלֹהֶיךָ, שֹׁאֵל מֵעִמָּךְ" - "And now, Israel, what does the Lord your God require of you?" Rabbi Meir uses a play on the word מָה, saying instead - מאה. In effect, this then translates to - "And ...


8

A fire is a fire is a fire - See OH 673(1) ואע"פ שאין השמנים נמשכים אחר הפתילה ואין האור נתלה יפה באותם הפתילות Even though the wicks don't absorb the oil well and the light [fire] doesn't attach well to those wicks (--translation mine) (i.e. even if your lights are poor, your still yotzeh the mitzvah). That being said, the מצוה מן המבחר is to use ...


8

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 ...


8

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 ...


8

The Shulchan Aruch in סימן תרלב - דברים הפוסלים בסכך says: א סְכָךְ פָּסוּל, פּוֹסֵל בָּאֶמְצַע בְּד' טְפָחִים; אֲבָל פָּחוֹת מִד', כְּשֵׁרָה, וּמֻתָּר לִישַׁן תַּחְתָּיו מִן הַצַּד אֵינוֹ פּוֹסֵל אֶלָּא בְּד' אַמּוֹת, אֲבָל פָּחוֹת מִד' אַמּוֹת, כְּשֵׁרָה דְּאָמְרִינָן דֹּפֶן עֲקֻמָּה, דְּהַיְנוּ לוֹמַר שֶׁאָנוּ רוֹאִים כְּאִלּוּ הַכֹּתֶל נֶעֱקָם ...


7

The Talmud (Shabbat 91a) discusses the minimum measurement of food that must be carried between domains on Shabbat in order to be obligated in punishment. The minimum shiur depends on what the intended use of the object is. A kegrogeret (the size of a dried fig, which is greater than or equal to a kezayit) is the minimum amount of food when the food is ...


7

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, ...


7

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.


7

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 ...


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