Shabbat 66 - May 11, 17 Iyar

Today's shiur is dedicated for a refuah shleima for Netanel Ilan ben Shayna Tzipora who is undergoing surgery today.

Can one go out on Shabbat with a prosthetic leg. The mishna discusses a number of different types of things that one who doesn't have a leg might be using and can they go out with it on Shabbat, are they susceptible to impurity of midras (an item one sits/leans on), are they consdiered a shoe as regards various laws that relate to shoes (forbidden to wear them in the azara of the temple, chalitza needs to be performed with a shoe). If a prosthetic leg has a concave space to put pads, would it be susceptible to impurity because it has a receptacle? Rava and Abaye disagree regarding whether this is referring to regular impurity or impurity of midras. Each brings support for his opinion. Male children (and others) can go out with knots. Apparently they were used for sick people or even to prevent people from getting sick. The gemara explains that the mishna spoke about boys because it was known to help boys who had issues separating from their father (there are different explanations as to what this means). The gemara discusses other things that are allowed for medicinal purposes as well as commonly used segulot.