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6
votes
1answer
155 views

What does Maimonides say about geocentrism?

I have read that Maimonides described the universe in a geocentric fashion, but I have not been able to find the specific passages to which they refer. What does Maimonides say about geocentrism?
11
votes
3answers
422 views

Time dilation and waiting between meat and milk

Suppose Ploni eats some meat. He then gets in a spaceship and accelerates to some significant percentage of the speed of light for a short trip into outer space, and then returns home. At the time ...
2
votes
2answers
214 views

Synthetic unkosher meat?

Suppose tissue identical to that of a pig could be created synthetically (with kosher ingredients) in a science lab. The meat would be completely indistinguishable from pig meat, but it would never ...
2
votes
3answers
224 views

How was kashrut affected by Science?

I have been reading a lot of questions concerning kosher foods, to get a better understanding of what it means for something to be kosher. To an atheist, this site is very helpful. But as a chemistry ...
8
votes
2answers
209 views

Cryonics in Judaism

I was recently reading an article about cryogenics, there are around 200 bodies frozen in cryogenics labs around the world, and in the article they said that in the near future they may be able to ...
1
vote
2answers
206 views

Why not determine how long to wait between meat and milk using science?

If the time required to wait between eating meat and milk is based on the scientific definition of digestion, why don't we ask today's experts and set a defined time for everyone instead of different ...
11
votes
2answers
587 views

Can an Alien convert to Judaism?

Suppose we one day find an extraterrestrial walking on our planet that originated from another planet. The alien quickly learns all about religion and now wants to become a Jew. Do we let him? ...
12
votes
1answer
207 views

Who knows science?

On whom does one recite the blessing "ברכת שנתן מחכמתו לבשר ודם" (the blessing recited on non-Jewish scientists)? Does he have to be a Ph.D? Does he have to have inventions to his name? Did he have ...
2
votes
3answers
236 views

Theology on evolution from khan academy

In this video on khan academy, Khan makes a few theological points regarding evolution. His main point is that evolution can be reconciled with intelligent design by saying that God could have created ...
3
votes
1answer
793 views

What are the colors of the rainbow?

While the colors of the rainbow (or spectral colors) form a continuum, people have assigned them to finitely many pigeonholes for centuries and probably millennia. Apparently, Newton used seven colors ...
7
votes
4answers
317 views

Would synthesized meat be Kosher?

Scientists are preparing synthesized meat for human consumption. See here for a excerpt, and two articles here and here. My question is: Would this meat be considered Kosher? Might it depend on the ...
10
votes
2answers
295 views

Kosherizing Water using Distillation

Suppose I have water that was cooked with non-kosher food. I then take the water and distill it. Would this water be considered permissible to drink?
18
votes
2answers
342 views

Mushrooms in a Vineyard

The bracha on a mushroom is "shehakol" because the Talmud (Berachot 40b) correctly (I think) states that mushrooms do not derive their nutrients from the ground. If a mushroom is growing in a ...
12
votes
1answer
142 views

In what way are mushrooms considered “non-nutritive”?

The Mishnah (Eruvin 26b) states that water and salt can't be used as the food for eruv chatzeiros or eruv techumin (thus Rashi; according to Tosafos only the latter). Rashi explains that this is ...
4
votes
1answer
139 views

How is Hagalah done on glass?

With regards to using glass vessels on Pesach that were used year round, The Shulchan Aruch HaRav (Orach Chaim 451:63) says that, for Ashkenazim, if the glass vessel was used multiple times during the ...
3
votes
5answers
136 views

The Plague of Darkness

This is a two fold question 1)The plaque of darkness has considerable commentary, however I have yet to find a rabbi who speaks about what created the darkness. Therefore, What created the darkness ...
2
votes
1answer
148 views

Archaeology and תחיית המתים

A few minutes ago, while standing in the rain and seeing some people passing out some pamphlets an idea occurred to me. Are there any papers, books, dvar torahs etc, which links the traditional ...
7
votes
3answers
255 views

Is olive oil unhealthy?

The Gemara in Brachot 35b says that the proper bracha on pure olive oil is "Borei Peri HaEtz". However, it says that this refers to when you mixed the oil with some אניגרון which Prof Marcus Jastrow ...
10
votes
6answers
273 views

Does the colouring of animals depend on what the mother sees before conception?

What is the meaning of the hishtadlus that Yaakov made with the conception of the animals starting at 30 (37)? Is it or was it a natural thing that the colouring of animals depends on what their ...
8
votes
1answer
275 views

Retention of urine causing infertility?

In several places in the Gemara (Yevamos 64b, Bechoros 44b) it is stated that holding back urine for an extended period can cause a man to become infertile. In the latter place the Gemara gives a ...
8
votes
3answers
513 views

Why does the Talmud assume a woman cannot get pregnant on the first act of intercourse?

There is a rule in the Gemara (Yevamot 34a) that אין אשה מתעברת בביאה ראשונה. The question is why the Talmud assumes that a virgin cannot conceive on her first act of sexual intercourse if the hymen ...
18
votes
4answers
669 views

Does artificial meat grown in a petri dish have the halachic status of meat?

Scientists are developing means of growing artificial meat in a petri dish. Does such 'meat' have the halachic status of meat? Source: ...
4
votes
2answers
1k views

how old is Judaism?

How old is Judaism - not legendary, but indicated by science? What are the oldest scriptures found of the story of Moses, for example? Or are the scriptures imported from very different cultures so ...
13
votes
8answers
641 views

Reconciling the evidence for the Uncertainty Principle with belief in an omniscient G-d

One of the foundations of modern quantum mechanics is the Uncertainty Principle. This principle is not an assumption, but rather is derived from assumptions made with regard to the structure of ...
7
votes
4answers
335 views

How does salt “add heat” (mishna in Shabbos 4(1))

The mishna in Shabbos 4(1) tells us which materials may not be used to insulate foods for Shabbos because they "add heat". One of these materials is salt. Can anyone explain how salt can add heat ...
14
votes
4answers
978 views

Time Travel and Judaism

Has time travel ever been discussed before in terms of Judaism? According to Judaism would (should) it be possible to travel through time?
10
votes
1answer
179 views

What is the “Kos Shel Ikrin,” a potion that renders one infertile?

The Talmud discusses the "Kos Shel Ikrin" (Cup of the Barren, or Cup of Roots), a potion that rendered a woman or man infertile. The recipe for this potion is on record in tractate Shabbos and there ...
14
votes
7answers
432 views

why half-believe the Torah?

(I'm not sure this is on-topic, and feel free to close it if it's not, of course.) I understand some who study the Bible claim natural reasons for things we recognize as miracles, from the plagues of ...
5
votes
2answers
168 views

Science of the Rishonim on “celestial spheres”

In the writings of the Rishonim, it is not uncommon to see explanations of pesukim or of aggadic concepts using the "celestial spheres" model of the universe. The Rambam in particular uses the idea ...
8
votes
6answers
449 views

Rationalist Position on Bible Ancients' Long Lives

How would a rationalist interpret the long lives of the ancient people enumerated in the Bible, from Methuselah on down? Virtually no person lives more than 120 years today, even with the assistance ...
14
votes
3answers
335 views

Let there be light! But from where?

According to Genesis 1:3, "And G-d said, Let there be light; and there was light." What light is the Torah referring to if the sun which produces light by day was created only on the 4th day of ...
9
votes
3answers
245 views

How do scientists such as Natan Aviezer and Gerald Schroeder understand the fourth day of creation?

If I understand correctly, scientists such as Natan Aviezer and Gerald Schroeder have readings of Genesis Chapter 1 that fit with the current scientific understanding of how the universe/planet/life ...
18
votes
7answers
698 views

Why the vast difference of opinion about the age of the Universe?

5770 and 13,000,000,000 is a big difference! I am looking for a good explanation to the difference opinion of the age of the universe. Please help me out!
22
votes
5answers
504 views

Why do Jews physically resemble members of their “host” nationalities?

Why do Jews often so closely resemble the members of the nationalities amongst whom they have been living for only a few hundred years? How do features spread through such an exclusive population so ...
21
votes
8answers
980 views

Bereishit vs. science

How does Judaism deal with the differences between scientific evidence of the beginning of the world and the account(s) in Bereishit?