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10
votes
1answer
82 views

Can an ultrasound be relied upon?

I have read reports of the accuracy of gender prediction from an ultrasound with numbers ranging from 90-98%. There is a halacha (Y.D. 194:11) that if a fetus sticks its hand [or possibly any limb] ...
6
votes
1answer
45 views

How do you inspect a field for graves?

The Gemara (Bab. Nazir 65) discusses some circumstances in which one must inspect a field for graves. How is this done? Do you dig up the earth to a certain depth? Do you dig a trench? Do you dig ...
5
votes
1answer
157 views

Notched 2x4 for maamid?

Let's assume that there is a lechatchila to not use metal object that are mekabel tumah (susceptible to tumah) for something that supports the s'chach ("maamid"), which can be avoided by using ...
3
votes
1answer
37 views

Could a Cohen burn a body to escape the impurity?

Excuse the extreme hypothetical, but: If a Cohen were locked in a room with no windows and a dead body, and just so happened to have lighter fluid and a pack of matches (and there were small holes in ...
3
votes
1answer
42 views

The Impurity of Teeth

In Bemidbar 19:16, the Torah mentions impurity conveyed by a person's bone. From this, the gemara learns out that those parts of a corpse that convey impurity are those parts that are like a bone in ...
1
vote
1answer
71 views

How does Tum'ah (“Ritual Impurity”) work?

What are the mechanics by which Tum'ah works? How does one detect it, or diagnose someone as Tamei? Certain materials can contract and transfer Tum'ah. Why do these material do so, but others ...
6
votes
0answers
48 views

Post mortem Tahara

I'm looking for sources discussing the religious aspect of the Tahara done on deceased Jews. I recall someone mentioning that the religious aspect of it was a practice we picked up from the Muslims ...
6
votes
0answers
70 views

Beam for s'chach with wood glue + embedded screws

Let's assume that there is a lechatchila to not use metal object that are mekabel tumah (susceptible to tumah) for something that supports the s'chach ("maamid"), which can be avoided by using ...
5
votes
0answers
58 views

Must hand washing be done with pure (fresh) water?

It seems from here both that some types of water are considered too salty to be acceptable for ritual handwashing and that mikvah water is always considered acceptable. I am left wondering what, ...
5
votes
0answers
68 views

Why was the oil in the temple tamei at all?

Regarding the story of Chanukah and the need for tahor oil, I recall hearing in a shiur one time that there are 4 things which are not susceptible to tumah from the Torah; oil (a subset of mashkin) ...
5
votes
0answers
106 views

Blessing on Immersing Vessels to Purify Them

A Mikvah can be used to purify humans or certain vessels which have contracted ritual impurity (Rambam Mikvaot 1 (English)). When humans use the Mikvah to purify themselves they recite a blessing ...
5
votes
0answers
55 views

Tourist guides for Kohanim

I recently saw a tourist guide for Kohanim, published online by the Chicago Rabbinical Council, listing certain Chicago tourist sites that are, and are not, problematic for Kohanim. Are there any ...
5
votes
0answers
114 views

Putting poison inside bamboo rods (s'chach)

It says in Shulchan Aruch (OC Siman 629 Sif 3) that one may cover a Sukkah with "chitzim" (arrows) that don't have a "beis kibbul." However, if they do have a "beis kibbul," then it's not valid for ...
4
votes
0answers
67 views

What are the Tumah implications outside of Temple?

What are the implication of tumah other than related to the Temple? E.g., a pathologist in, say, Australia is contaminated with Tumas Mes all the time. Does he have to travel to Jerusalem to get ...
1
vote
0answers
30 views

When does טומאת הסגר begin?

When the Chumash speaks about a kohen's seeing some tzaraas on a person's body for the first time, it says the kohen "shall defile" (Vayikra 13:3, 13:11, 13:20, 13:25, 13:30, 13:44). Rashi (13:3) ...
1
vote
0answers
42 views

רש״י's use of the קל וחומר after it's been discredited (שבת כו ע״ב)‎

The Bavli, Shabas 26 amud 2, derives from some wording in Vayikra that a three-finger-by-three-finger piece of wool or linen fabric can become tame. It then proposes that the verse teaches us only ...
1
vote
0answers
84 views

Why make the Kohen burning the Para Aduma rabbinically impure?

The Gemara says that we make the Kohen burning the Para Aduma (the red heifer) impure and then dip him in the Mikva. The reason given is that there is an argument between the Rabbis and the Sadducees ...
0
votes
0answers
56 views

Examining the Zav

Does anyone know of any rabbinic sources (Talmudic/midrashic) that indicate that a Zav would go to a halakhic authority to be examined regarding his Zivah?