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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.


9

First of all, the whole point of the 'river turning to blood' was that it was supposed to be a miracle, an event showing that superiority of a force over the natural world (i.e. science). So, if anything, your example proves that the Jews DO believe in modern science, as they believe that there's no natural way to turn water into blood without divine ...


7

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

Technically, "modern science" incorporates quantum mechanics, which includes the ideas of particles "blipping" in and out of existence, as well as that of all that science predicts are probabilities not definitive absolutes. So modern science doesn't really contradict the miraculous (which are essentially then statistical anomalies). Furthermore, at a ...


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 would say that this is a question of the definition of testimony. We have the halachos in a number of places, including the talmud and Rambam hilchos Yibum, hilchos gittin, and hilchos nashim, about the circumstances as to who is believed if they come before bais din and testify that a person is dead. The implication of all of these is that the witness is ...


6

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 ...


5

Granting that time travel would ever be conceivable, I would make the following comments: Initially a reason should be provided to suggest that something is assur. Coincidentally however, I have thought of a comparable precedent which demonstrates how it is permissible to travel through time. Whenever we move, we inevitably alter time imperceptibly ...


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

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

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 ...


4

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 ...


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

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

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

Far from being a "simple" question, this is actually very complicated, and I'm in no position to answer it properly. I can tell you, however, that the doctrine to which you refer is kabbalistic. There are allusions to it in the Ramban's (Nachmanides') commentary on Genesis 1:1 and in the writings of other mediaeval scholars. Its fullest treatment is in the ...


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

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 ...


2

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 ...


2

Believe it or not, the gemara discusses cases where an individual can have 2 polar opposite statuses at the same time (for example see here). There are a number of cases brought in the gemara (Gittin 41b, Mishna Pesachim 8:1, etc.) of a person that is 'half slave, half free'. Of course, if you are a slave then by definition you are not free and vice versa. ...


2

There are a number of opinions regarding the observance of Shabbos in the Arctic circle where the sun may not rise/set for 6 months. Each opinion may have ramifications for space travel where there is neither sunrise nor sunset, as well as the issue you raise based on the relativity of time. There does not seem to be a halachik consensus on these matters. ...


2

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 ...


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

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

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: ...


1

In a letter posted here discussing reinterpreting established Torah truths in light of modern discoveries, the Rebbe zy"a writes: It was conceivable, in those days, that if one approached a student who dabbled in science and told him that according to the Torah-hashkofo [Torah outlook], the sun revolves around the earth, he might well repudiate Torah ...


1

Shemos 17:25-26: ויאמר משה אכלוהו היום, כי-שבת היום ליהוה: היום, לא תמצאוהו בשדה. ששת ימים, תלקטוהו; וביום השביעי שבת, לא יהיה-בו And Moses said "eat [the Manna] today, as today is a Sabbath for G-d. Today, you will not find it in the field. 6 days collect it, and on the seventh rest, for it will not be there. This verse cannot be interpreted ...


1

This Star K article states: (highlighted words are mine) If a normal prevailing wind (ruach metzuya) can blow the schach off the sukkah, one may not tie the schach down to hold it in place. The reason is that an item which is not kosher for schach (e.g. string) may not be used to hold down kosher schach. Instead, one must place a wooden beam ...



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