This 2014 episode covers why when the Great London Smog descended in December of 1952, nobody initially realized anything unusual was going on. At its largest, it extended 30 kilometers around London, and it killed thousands of people.

SYMHC Classics: Haymarket Riot
37:40

Behind the Scenes Minis: Serving Lip and Ethics
26:19

James Braid, Surgeon and Father of Hypnotism
43:36