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13

First, it may not be valid to assume that creation was bound by the laws of science as we now understand them. Why should we assume that the very first plants grew by photosynthesis in the same way that plants do now? Or if we do, why not assume that the primordial light created on the first day was enough to produce this effect? But setting all that ...


6

According to a shiur I heard recently, there's a Machlokes Rishonim (early Poskim argue) about whether the Mitzva of Shmitta is: Don't work your land - but your land may work. Your land may not work - no matter who and how the work involved. This - apparently - directly affects the answer to your question, as well as to whether you may lease/sell your ...


4

It is only prohibited to cut down trees for no purpose, but what "purpose" includes is hard to define. Rambam Laws of Kings 6:9 deals with your case directly, however: כל אילן סרק מותר לקוץ אותו ואפילו אינו צריך לו. וכן אילן מאכל שהזקין ואינו עושה אלא דבר מועט שאינו ראוי לטרוח בו. מותר לקוץ אותו. It is permissible to cut down any non-fruit bearing ...


4

Strictly speaking, Peah doesn't have to be from the corners of the field. (Mishnah Peah 1:3). The mishnah says that the minimum measure of a field that should be reserved for peah is 1/60th (Mishnah Peah 1:2) although there's no maximum, so I would assume the same ratios would apply to a round field. Peah is also usually left to one side of a field, so it ...


4

It's pure geometry. The simplest example of this in 3D is that the surface area of a hemisphere is double the surface area of a flat circle, so if you grow things on the surface you have double the area (wikipedia.org/wiki/Sphere). Area of circle = pi*r*r Area of curved part of hemisphere = 2*pi*r*r EDIT: Obviously, this is just a simple example to ...


4

The Rambam (Kilayim 1:3) and the Shulchan Aruch (YD 297:2) explicitly rule that the issue of Kilaei Zeraim (planting mixtures of edible seeds (except grapes)) only applies in the Land of Israel and a Jew can even plant his own mixtures outside of Israel on purpose.


3

It seems that the Mishna (the source of what you are quoting) differentiates between an open miracle and a natural miracle. Once one has started measuring one's granary - then if it increases it's an open miracle. Open miracles are too obvious and rarely happen. Before one has started measuring, then an increase is impossible to prove. The Mishna suggests ...


2

It's in the Kitzur Shulchan Aruch - in סימן נח - דין ברכת הריח. סעיף א': כְּשֵׁם שֶׁאָסוּר לְאָדָם לֵהָנוֹת מִמַּאֲכָל אוֹ מַשְׁקֶה קֹדֶם שֶׁיְבָרֵךְ, כָּךְ אָסוּר לוֹ לֵהָנוֹת מֵרֵיחַ טוֹב קֹדֶם שֶׁיְבָרֵךְ, עָלָיו, שֶׁנֶּאֱמַר, כָּל הַנְּשָׁמָה תְּהַלֵּל יָה. אֵיזֶהוּ דָּבָר שֶׁהַנְּשָׁמָה נֶהֱנֵית מִמֶּנּוּ וְאֵין הַגּוּף נֶהֱנֶה מִמֶּנּוּ. הֱוֵי ...


2

The bracha on smelling Rose water is borei atzei besamim (Orach Chaim 216:3). Rose water is produced via condensed steam as discussed http://en.m.wikipedia.org/wiki/Rose_water


2

The Gemara in Bava Kamma 91b discusses this: אמר רב דיקלא דטען קבא אסור למקצציה מיתיבי כמה יהא בזית ולא יקצצו רובע שאני זיתים דחשיבי א"ר חנינא לא שכיב שיבחת ברי אלא דקץ תאינתא בלא זמנה אמר רבינא ואם היה מעולה בדמים מותר תניא נמי הכי (דברים כ, כ) רק עץ אשר תדע זה אילן מאכל כי לא עץ מאכל הוא זה אילן סרק וכי מאחר שסופו לרבות כל דבר מה ת"ל כי לא עץ מאכל ...


2

I'm making this a "community wiki" post so others can edit it more easily (and I don't get reputation points for it). Please edit! Tevel. Orla. R'vay, t'ruma, peret, etc., depending on circumstances. Nosar, pigul, lan baazara, etc. Kil'ay hakerem. Tikroves avoda zara. Ir hanidachas. Ashera. Arbaa minim and s'chach and Sukka decorations on Sukos. (S'chach ...


2

The word שחת means produce of wheat or barley cut from stalks of grain which have not yet grown fully - see Rashi in Avodah Zora 20b. However, at the top of Daf 71a it says that there are several stages of growth of the grain: 1) חשרשה (when the planted grain takes root). 2) אגם (when the grain has grown enough so that the top of the stalk can be bent down ...


1

R Avrohom Yeshaya Karelitz (Chazon Ish Shevi'it 5:12) writes that were we to give Maaser Rishon nowadays to Leviyim on the basis that they claim the Levi Aliya in Shul, more people would lie and pretend to be Leviyim because of the financial benefit. However, most authorities seem to think that Maaser Rishon (taken from certain Tevel) should (at least ...



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