Category Archives: Torah & Science

Making Babies: Is it Possible to Influence Gender?

Note: for the purposes of this article, the terms “gender” and “sex” are used interchangeably.

This week’s double parasha, Tazria-Metzora, begins with the laws of when “a woman conceives and gives birth to a male…” (Leviticus 12:2) The actual Hebrew wording here is ishah ki tazria, literally “when a woman gives seed”. Based on this, our Sages taught that if a woman “gives seed” first, the child will likely be male, whereas if a man “gives seed” first, the child will likely be female (Niddah 31a). How exactly is this to be understood? Continue reading

The Science of Chametz

As we continue celebrating Pesach this week, and avoiding all things chametz, it is important to take a moment and explore what exactly is chametz? While we spend a tremendous amount of time and effort learning about, and implementing, the various halakhot regarding eliminating chametz, we rarely think about what chametz actually is on the chemical level. If we did know, it would help to clarify what specifically is forbidden, and might save us a great deal of time and effort in our preparations. It would also help us better understand what actually happened in Egypt with our ancestor millennia ago (the answer may surprise you). So, what is chametz? Continue reading

Genetically-Modified Moses?

At the end of this week’s parasha, Ki Tisa, we read how Moses descended from Mt. Sinai with his face glowing brilliantly (Exodus 34:29-30). The people could not look at his face directly, so he had to wear a mask. The exact wording in the Torah is karan ‘or panav (קָרַ֖ן ע֣וֹר פָּנָ֑יו). The latter two words are clear: “the skin of his face”. But what does karan mean? The most direct translation would be “horn” which is actually why, comically, throughout history some artists depicted Moses with horns! Another way of translating it is as “radiant” (based on this, the Modern Hebrew term for a ray or radiation is k’rinah, קרינה). Rashi comments that both are accurate; karan does indeed come from the word for “horn” because light rays shoot forth like “horns”. If we take a look at Midrash (with a little help from science), we will find that the Torah is secretly encoding something much more profound. Continue reading