Intentional vs inadvertent - The Monsey shechita fraud of 2006

The  story of the Baal Hatenya’s geziera and the incredible discovery of R Akiva Eiger

The Chasam Sofer’s psak halacha on the physical difference between a Jew vs non Jew 

Blood transfusions from a non Jew: the psak of the Chelkas Yaakov, and the extraordinary story with Ponevezher rav’s transfusion in Mount Sinai NYC 

Eating fish on shabbos d’oraisah? The Tzemach Tzedek’s boycott