Holly and Tracy ponder why the wrong photo has become used so frequently in mentions of Margaret E. Knight. Tracy shares the reasons she almost didn't cover Henry Martyn Robert on the show.

Robert Moses and the Shaping of New York, Part 2
42:12

Robert Moses and the Shaping of New York, Part 1
41:59

SYMHC Classics: Eradication of Smallpox
43:25