Beitzah 7a and Beitzah 7b, the significance of knowing when an egg is completed, for business purposes, for eating meat and milk, and of when hens lay their eggs for muktzeh concerns, and then moving on to the other parts of the Mishnah, why Beit Shammai think the Torah prohibited owning different amounts of leavened bread and of yeast, and what the disagreement was when it came to slaughtering an animal or bird where one did not have dirt prepared before.
