Shabbat 73: The 39 Melakhot of Shabbat

First, Abaye vs Rava on throwing an object in reshut harabim -- if the resultant action alines with your own concerns, don't you have to bring a korban? Which brings us to the component parts of a complete action of melakhah: your act and your intent. Plus: The 39 prohibited creative labors of Shabbat - a list worthy of its own discussion. Including the groupings that help us remember the list better, as mnemonics.