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13

See also this letter by the Lubavitcher Rebbe on this subject, in which he states: It is my firm belief that the sun revolves around the earth, as I have also declared publicly on various occasions and in discussion with professors specializing in this field of science. He also explains why he believed this way based on the Theory of Relativity.


10

Dr. Jeremy Brown, in a post on his Talmudology blog on science in the Daf Yomi, points out that Rava, quoted in Yevamot 97a, provides the first published claim that boys' puberty can be delayed by their being either overweight or underweight. כי אתו לקמיה דרבא אי כחוש אמר להו זילו אבריוהו ואי בריא אמר להו זילו אכחשוהו דהני סימנין זמנין דנתרי מחמת ...


7

Apparently Rambam said: בבוקר אכול כמלך, בצהריים כבן מלך ובערב כאביון eat breakfast like a king, lunch like the son of a king and dinner like a pauper. among his other advice for health which seems to have stood the test of time. I read about this study last year which seems to confirm the wisdom of the above advice: High caloric intake at ...


6

If a five-time Oscar winner makes stupid comments about current political events he knows nothing about, does that mean we shouldn't trust his advice about acting? Of course we should: his acting has been tried and found true. Similarly (though l'havdil), any authority the Jewish community as a whole has examined over the years and accepted is a "winner".


6

As Rabbi Yaacov Dovid Lach explains in his book Chullin Illuminated they are a fibrous adhesion that connect parts of the lungs to each other or to the surrounding walls of the chest cavity. In healthy lungs they are not present and thus indicate a problem. The exact nature of this problem is a matter of dispute (it either is caused by a previously present ...


6

I think their main point is not that the theory in all its details is identical to the Jewish tradition. For thousands of years, conventional western wisdom was based on the Aristotelian assumption of kadmuth ha'olam - that the universe always was as it is. The modern discoveries of physics which talk about a finite point in time before which human ...


5

It seems that Rambam anticipated certain aspects of Einstien's General Relativity. The traditional view was that time is absolute and constant: "Absolute, true, and mathematical time, of itself, and from its own nature, flows equably without relation to anything external." Issac Newton However, in the Guide to the Perplexed, Rambam sees time ...


5

I don't know if they address this concern particularly in terms of the expense. However, the knowledge that murex indigo is chemically identical to plant-based indigo is something knowable only in the 20th and 21st century, when we know about atoms, molecules, and chemicals. If plant-based indigo failed the gemara's test for fastness, and this was just a ...


5

See THE LAWS OF PESACH BY RAV DAVID BROFSKY from etzion.org.il First part of the quote is background. Shiur #2: The laws of Pesach. Defining chametz. Two passages in the third chapter of pesachim discuss the definition of “chimutz” (leavening). one passage (pesachim 48b) presents the physical characteristics of chametz. the mishna describes the ...


5

The most straightforward reading -- I'd say this is based on the Talmud -- is that it's miraculous. And only works if the husband has been behaving himself too, and if this is a rare and shocking event. Hence it stopped working sometime during the Second Temple period. (In effect, normally if a husband warned his wife not to hang around with Billy Bob, and ...


4

According to the source in this answer to that question, Rabbi Menachem Genack of the OU had been quoted as saying The tissue samples would have to come from an animal that had been slaughtered according to kosher rules


3

The Maharal in Be'er Hagolah discusses various "medical" or "scientific" parts of the Gemara (especially be'er 6 and 7). He explains that despite the fact that they don't seem to correspond to anything that would be helpful nowadays, there are metaphors and hints to important theological ideas behind what appears to be medical advice. Thus, these parts of ...


3

In 1975 the following letter was sent to a local Chabad emissary: June 30, 1975 Rabbi Feivel Rimmler 824 Eastern Parkway Brooklyn, NY 11213 Dear Rabbi Rimmler, As per our conversation of today regarding taharat hamishpacha [family purity], etc., I did say to you, and am submitting the same in writing by means of this letter, that if the Rebbe would ...


3

Here's another "grain of salt" answer. If you accept the Vilna Gaon's drasha on Melachim Aleph 7:23, then Shlomo HaMelech knew pi to be 333/106=3.14151, a value not surpassed in accuracy by the scientific community for more than 1000 years, with Ptolemy's publication of 3.1416 in c150 CE.


3

An excerpt from Alei Shur (Shaar Rishon Ch. 12 p. 56): והנה בערך בזמנו של רבנו הקדוש היה חי באלכסנדריא האסארונום הגדול פטולימייוס מחבר ספר האלמגסט שמתוכו למדו אסטרונומיא עד הזמן החדש. כאשר נודע לפטולימייוס זה על מחזור הי"ט שנה והידיעות הברורות בחשבון סיבוב הלבנה וכו' עליהן הוא מתבסס - השתומם מאד, כיצד היתה בידי חכמי ישראל ידיעה שחכמי האומות טרם עמדו ...


3

This question was the root of an argument between Dr. Schroeder and Rabbi Slifkin. Dr. Schroeder insists (in his book Genesis and the Big Bang, and in many public lectures) that the order of creation in the Torah is meant to be taken chronologically and is correct. He explained the flying creatures which existed before the land animals to be referring to ...


3

On the whole, even the wicked people (or idolators) of the Bible do believe in some form of theism, even if not monotheism or the God of Israel, יקוה. To quote the Encyclopedia of the Bible and Its Reception on "Atheism": The theoretical objection to the idea of the existence of god(s) is beyond the intellectual world of ANE [Ancient Near East] and HB/OT ...


3

From your assessment about the impracticality of observing and experimenting it seems your understanding of ruach meyzuyah is a wind that under normal circumstances can and might eventually blow, I would suggest that this is not the case. Rather, Ruach metzuyah means a wind that does blow. Practically constantly. First of all is the Mechaber in hilchos ...


3

I'm not sure what you mean by "the Torah" knowing. The Torah was given from Hashem, and He is obviously aware of how He made the world. The Torah won't be saying something that is not true. Therefore, it can't be saying something that is the opposite of true scientific discovery. As far as if all scientific facts of the universe is in the Torah, we find the ...


3

There's a story in the Talmud - Shabbat 31a - about a guy who tried (unsuccessfully, as it turned out) to win a bet by provoking Hillel to anger. He posed three questions about phenotypic variations in certain human populations: מפני מה ראשיהן של בבליים סגלגלות א"ל בני שאלה גדולה שאלת מפני שאין להם חיות פקחות [He asked,] "What is the reason that the ...


3

Actually, a number of meforshim explain that it starts with the the general and then gets specific. Thus the first verse (Bereishis) refers to the entire process (all seven days). The Art Scroll Chumash states "In the beginning of Hashem's Creating" This phrase is commonly rendered In the beginning Hashem created, which would indicate that the ...


3

As far as I know (from experience around the industry) this is a generally recognized phenomena. Consider Flavor Scalping, where the packaging absorbs the flavor of the contents and vis-versa. Now, I'm sure in the details the Halacha is way more strict in many cases beyond a scientific understanding of the situation, but the basic notion is certainly well ...


3

Even assuming the 7 days are symbolic/conceptual as opposed to literal does not mean that their commemoration cannot be with a literal 7th day. Indeed, if one loses track of the days of the week (e.g. at sea) he keeps every seventh day anyway. (There are many mitzvot where something concrete represents something conceptual, e.g. teffilin, sukka, korbanot, ...


2

It occured to me while reading the Gen 1, that reptiles may be implied by the verses. First check out this answer. The exegetical approach used therein is the one I am attempting to use. Next, note the wording of verse 20, when water life and flying things are introduced: וַיֹּאמֶר אֱלֹהִים--יִשְׁרְצוּ הַמַּיִם, שֶׁרֶץ נֶפֶשׁ חַיָּה; וְעוֹף יְעוֹפֵף ...


2

"And it was evening, and it was morning, *one* day"? Also, one can consider that "time started" in the way we know it only at the end of creation with the creation of Shabbat. Thus, only Shabbat has to be considered a 24 hour day. For example the sun moon and stars were created on the fourth "day" so that "before" then could not have been days as ...


2

Heliocentrism or geocentrism or whatever is entirely irrelevant to halachah; at most there is a question whether certain Biblical verses or aggadic comments correspond to (current scientific understanding of) the universe as it is, or reflect the way we perceive the world, similar to the continued use of the English words “sunrise” & “sunset”. That ...


2

This requirement is stated in the Tosefta and Meseches Tzitzith Tosefta Menachoth 9:16 "תכלת אין כשרה אלא מן החלזון הביא שלא מן החלזון פסולה." Tekheleth is only valid from the חלזון ; if one used a dye not made from the חלזון it is invalid.” מסכת ציצית פרק א הלכה י שאין צובעין תכלת אלא בחלזון. We only dye תכלת with a חלזון from: ...


2

Surprisingly enough, proteins (such as those found in food, especially in meet) have a great affinity in binding to steel surface layer. On top of this, proteins also tend to affect the chemical composition of the stainless steel surface, by selectively releasing metal ions from the stainless steel alloy. https://en.wikipedia.org/wiki/Protein_adsorption ...



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