On a previous episode (Can You Make Seltzer on Shabbat? Responsa Radio #80), you mentioned that there is room to be lenient on the rules of food preparation when welcoming guests on Shabbat. Is that the really the case? If so, what are the limits?

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The Shema is one of the most important prayers in Judaism, which is supposed to be recited when we go to sleep and when we wake up. But it's also part of the liturgy for morning and evening prayers. Which is more important? How many times a day should we be saying Shema?

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As a veterinary technology student, I'm struggling with ethics of the use of animals in biomedical research. How does the halakhic concept of avoiding pain experienced by living things -  tza'ar ba'alei hayyim - inform the treatment of animals in modern research? And is there a Jewish way to mark the death of animal outside of ritual slaughter?

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Content warning: this episode discusses suicide.

As an oncologist, I am often asked for guidance as patients approach end-of-life. To what extent am I obligated to encourage patients to continue life-prolonging treatment? How much does their quality of life matter? Am I allowed to mention physician-assisted suicide? Does anything if the patient is Jewish?

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I recently heard the idea that if the reason behind a rabbinic ruling (gezeirah) becomes irrelevant, because the surrounding factors are no longer applicable, the decree no longer applies. This sounds like it could undermine a lot of halakhah in modern times. What is the definition of this concept how and when can it be applied?
 
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We have an obligation to give tzedekah and care for those in need. At the same time, life is expensive and often requires having savings. Is it wrong to save money when others are suffering?

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Can Jews conduct audit studies? These are studies in which researchers send out fictitious job or service applications, a random selection of which have a characteristic that may be discriminated against. Researchers then measure the differences in callback rates. This kind of study is often considered ethical because the scientific gains outweigh the deception and lack of consent, but is that the case in Jewish law? What does halakhah have to say about lying for the sake of research?

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 Can I make seltzer, using a home soda maker, on Shabbat? 

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Many people in aveilut (mourning) observe a practice of changing their usual seat in shul. But mourners are also supposed to avoid public demonstrations of mourning on Shabbat. If you are in mourning, and going to shul on Shabbat, should you change your seat?

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In my family, after eating meat, we wait 3 hours until we eat dairy. Why 3 hours? And why don't I have to wait after eating dairy?

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