Is a person allowed to cut his hair or beard on Shabbat without using scissors or another vessel designed for cutting? What is the minimum amount that a person needs to cut in order to be liable?

What is the minimum amount that a food must be cooked in order for a person to be liable? Also: one person uses fire to make an object harder (like heating an earthenware vessel), while another person uses fire to make a hard object softer (such as melting wax). Which of them has violated Shabbat?

Yesterday we learned that cooking with a derivative of fire - like a kettle recently removed from the stove - is also a Torah prohibition. What about cooking with a derivative of the sun, like a hot cloth left in the sun? Also: is cooking cooked food a Torah prohibition?

What are the amounts for which a person is liable when he cooks on Shabbat? Does this prohibition include cooking dyes, as well as food? How about water for the purpose of washing, rather than for drinking?

What is involved in the prohibitions against grinding, sifting, and kneading on Shabbat?

The three conditions that permit borer (selecting) on Shabbat are taking the good from the bad, for immediate use, while using one's hand. Today's Maimonides Minute looks at how this rule is applied, including the question of the definition of "immediate use" and what is called "good from bad."

The Rambam explicitly says that winnowing, selecting, and sifting are very similar; in that case, why are they listed as three separate melachot? And how can borer (selecting) be done in a permissible way on Shabbat?

Wounding an animal is a violation of Shabbat, but why? The Rambam offers one opinion, but the Maggid Mishnah mentions two other ways to look at it. Also: when is it forbidden to squeeze a fruit for its juice on Shabbat, and when is it permitted?

What is the melacha of "dash" - threshing? How does it relate to milking a cow or injuring a human being?

When Chazal mention "the size of an egg," "the size of a dried fig," or "the amount of time it takes to cook an egg," what kind of egg or fig do they have in mind?