Notes on Gemara and Judaism, biology and bioengineering, and business ideas.https://shaunregenbaum.comenhttps://shaunregenbaum.com/blog/torah/the-belt-makes-it-obvioushttps://shaunregenbaum.com/blog/torah/the-belt-makes-it-obviousAt the end of כל הבשר, the Mishnah discusses how careful we need to be when meat and dairy are near each other.Sun, 16 Aug 2026 00:00:00 GMTTorahchullinhalachamarit-ayinhttps://shaunregenbaum.com/blog/torah/the-year-yom-kippur-was-shabbathttps://shaunregenbaum.com/blog/torah/the-year-yom-kippur-was-shabbatChullin 101b is in the middle of the laws of the גיד הנשה, but by now the daf is busy with a different question: can one prohibition land on top of another (אין איסור חל על איסור)?Sun, 09 Aug 2026 00:00:00 GMTTorahchullinaggadahyom-kippurhttps://shaunregenbaum.com/blog/torah/the-clusters-and-the-leaveshttps://shaunregenbaum.com/blog/torah/the-clusters-and-the-leavesChullin 92a continues the אגדתא that began on 91b.Fri, 31 Jul 2026 00:00:00 GMTTorahchullinaggadahhttps://shaunregenbaum.com/blog/torah/yisrael-kedoshimhttps://shaunregenbaum.com/blog/torah/yisrael-kedoshimThe Torah permits the fat around the sciatic nerve. The Jewish people avoided it anyway, and the Sages turned their practice into binding law.Fri, 31 Jul 2026 00:00:00 GMTTorahchullinhalachaminhaghttps://shaunregenbaum.com/blog/bio/growing-blood-vessels-in-a-labhttps://shaunregenbaum.com/blog/bio/growing-blood-vessels-in-a-labHuman tissue grown in a dish stops at about the size of a grain of rice, and the reason is diffusion.Wed, 29 Jul 2026 00:00:00 GMTBiologyorganoidsvasculaturetissue-engineeringhttps://shaunregenbaum.com/blog/torah/the-tradehttps://shaunregenbaum.com/blog/torah/the-tradeSooner or later, nearly everyone who lives a Jewish life asks the same quiet question: what is all of this for?Wed, 29 Jul 2026 00:00:00 GMTTorahemunahsimchasufferinghttps://shaunregenbaum.com/blog/torah/when-the-talmud-exaggerateshttps://shaunregenbaum.com/blog/torah/when-the-talmud-exaggeratesChullin 90b sits in the middle of the laws of גיד הנשה, the sciatic nerve that Yaakov's injury made forbidden.Wed, 29 Jul 2026 00:00:00 GMTTorahchullinaggadahguzma