Today, we're walking along a small street near the Louvre that's packed with history. Let's talk about Catherine de Medici's personal astrologer, the 1940s Resistance fighters of Les Halles, and talk about successful vaccines of the 1700s.  Visit my website for images. I am using a new microphone for this episode - if you have any thoughts about whether it is better or worse than the old one, let me know! (you can contact me through my website) As always, Improbable Walks is grateful to the technical expertise of Bremner Fletcher and to David Symons, the wonderful New Orleans accordion player who performs the Improbable Walks theme music.