From The Archives
Question: What are the things that is forbidden to draw? like the sun....?
Dear Deby
One should not draw the Sun, Moon, or stars.
If the art is done is a way which is three-dimensional, there are more objects which are forbidden. (See Shulchan Aruch, Y.D., 141, 4.)

From The Archives
Question: Can I leave my computer on downloading over Shabbos?
Answer: There is no halachic problem with beginning a download before Shabbat
even if it will finish on Shabbat.
If the download is of something such as a program which was purchased for money, one should avoid doing this.
In addition, it is preferable that the screen be turned off before Shabbat so that it should not be noticeable that the computer is doing this.
If the server from which you are downloading is located in Israel and one can assume that those who are operating it are not Shabbat observant,one should not perform such a download.
From the Archives
Question: Do we have to knock on peoples doors before entering? where do we know?
Dear Abie
One may not enter his own house and certainly not someone else's house abruptly in order not to violate people's privacy. This is something which our Sages described (Talmud, Nidah 16b) as an act which is hateful to G-d.
Halachic Sources
Question:  What are the various major sources we have for Hilchos Negiah? (Who says Assur, Mutar, Derech-Chiba, etc.)
This may be a very drawn-out answer, so I apologize in advance.
Thanks very much.
Dear Meir
According to the Rambam (Sefer haMitzvot, neg. commandment 353), the Smag (neg. com. 126), and the Hinuch (188), the Torah prohibits any physical closeness between men and women who are forbidden to each other, and in principle this prohibition carries the punishment of "malkot". According to these opinions, this prohibition is of the greatest seriousness, and would require a person to give his or her life rather than to violate it willingly. (Rama, Y.D., 157, 1.) The Ramban is of the opinion that this is a Rabbinic prohibition. The halachic  authorities discuss whether this prohibition refers only to touching in an affectionate manner or includes any touching whatsoever. (See Shach, Y.D., 195, 20, and Beit Shmuel, 20, 1.)

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Question From The Archives:
   I am doing a report with my friend about the kashrut of the sturgeon. Where can we find the machloket about the kashrut of this fish?
    You can find all the information you need here:
A. Rabeinu Tam in Tosfot Avoda Zara 40a d.h. Amar.
B. Ramban on Chulin 64a d.h. Ela.
C. Noda biYehuda is in Y.D. II 29.