Pesachim 45 - The Power of Transformation: Yeast vs. Bread

We discuss the unique prohibition of yeast on Pesach even if it is a chemical unfit for human consumption. This piece of Talmud is one of the foundations for the debate around the usage of chemicals made from non-kosher origins with respect to Kashrut. We also glean a powerful insight into the transformative power of substances and humanbeings.