When to Wash – Activities That Require Hand-Washing

“Do not cook a kid in its mother’s milk.”

Traditional Kosher cooking avoids all forms of meat and milk combinations, including poultry.

What is the origin of this prohibition and when did it begin?

Where should a mezuzah go? An analysis of the Chabad approach, where the mezuzah is placed on the doorpost opposite the hinges.

Scientific advances have unlocked some of the ‘source code’ of living organisms, where by splicing genes from, say, arctic salmon into strawberries, or mice into chickens, we can produce strains of plants and animals which grow better, are more resilient, and are more beneficial economically or otherwise.

While discussion abounds regarding the long-term health effects of these developments, what is the Torah’s view on such manipulation? Do the ethos of kilayim preclude meddling in G-d’s domain? Or does the command to “fill the earth and subdue it” (Bereshis 1:28) provide the ethical mandate to do just that?

What are the Halachic ramifications? Is the act of implanting the gene –in flora or fauna- a violation of kilayim? What is the kosher status of the resulting hybrids? Does the status of the donor carryover to the recipient? What if the transferred genes affect the presence of the traditional kosher signs? (a tuna with no scales, a shark with scales)? Is an Esrog which has been thus modified considered a Murkav, disqualifying it from use for the Mitzvah?

Is there a spiritual effect? Do the characteristics of those animals which the Torah deems negative carry over into the new creature? Would consuming this (otherwise Kosher) creature bring spiritual coarseness (timtum halev)?

A collection of Tshuvos and articles in Hebrew and English.

This paper features a compendium of sources for the
instruction of foundational aspects of the mitzvah of Tefillin.

It is common practice for those wearing a Tallis in shul, to remove it before entering a washroom. Why would a Tallis be any different than an ordinary pair of Tzitzis and Yarmulka that are never removed for this purpose

Jewish law regulates the consumption of food cooked by a Gentile. Is microwaving considered cooking for this purpose? This paper
illustrates how the ancient kashrut laws apply to modern technologies.