Meseches Shabbos Perek 20

Daf 137- The Halachic Status of an Infant’s Needs
Rabbi Moshe Rotberg, Author, Emergencies in Halacha

Daf 138- Creating an Ohel or a Mechitza
Rabbi Yehuda Gestetner, Rosh Kollel in Toronto, CA

Daf 139- Water Filters
Rabbi Yehuda Gestetner, Rosh Kollel in Toronto, CA

Daf 140- Alternative Refuah
Rabbi Yehuda Gestetner, Rosh Kollel in Toronto, CA

Daf 141-a – Toichen With a Shinui
Rabbi Yehuda Gestetner, Rosh Kollel in Toronto, CA