Luke talks about Rayleigh scattering, Mie scattering, and muon tomography! Come check out our website at https://www.podcastdotcom.net, a totally logical website name.
Sources:
http://hyperphysics.phy-astr.gsu.edu/hbase/atmos/blusky.html
https://cms.cern/content/muon-tomography
https://www.lanl.gov/org/padste/adeps/physics/thrusts/muon-tomography.php