Shabbat 66: Transferring a Fever to a Passing Ant (Not on Shabbat!)

Is a prosthetic leg to be considered a shoe? What about going out on Shabbat with prosthetics? The Gemara's discussion does not address what we might think is the key concern. Plus: Some Who's Who: Abaye. Also: Healing practices that don't involve grinding medicine - including... superstition? Some folks remedies seem more medicinal than others (and some of which were allowed on Shabbat).