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questions about science in relation to Judaism

8
votes
1answer
In several places in the Gemara (Yevamos 64b, Bechoros 44b) it is stated that holding back urine for an extended period can cause a man to become infertile. In the latter place the Gemara gives a rati …
asked Nov 15 '11 by Alex
19
votes
2answers
The Mishnah (Eruvin 26b) states that water and salt can't be used as the food for eruv chatzeiros or eruv techumin (thus Rashi; according to Tosafos only the latter). Rashi explains that this is becau …
asked Feb 1 '12 by Alex