Today’s Daf Yomi page, Shabbat 123, kicks things off with a long disquisition on tools and how to use them. Producer Josh Kross, a geek's geek, returns to explain why it's important to know how something works before buying it, and lament the mistakes too many people make by buying very powerful tools they neither need nor can properly use. Which questions should you ask yourself before shelling out for that powerful new computer or that snazzy kitchen gadget? Listen and find out.