In this week's show, wildfires have now spread to Italy, Canada, and the wine-producing region of France, Bordeaux. These fires produce a peculiar cloud phenomenon called pyrocumulonimbus and scientists plan to fly a jet over these clouds to determine how they operate. Also, we hear how drug-packed nanoparticles can aid brain cancer treatment, the genetic evidence of smallpox in Incan mummies, and how the smell of dad affects infant brain activity... Like this podcast? Please help us by supporting the Naked Scientists