Shackleton is famous for his expeditions in Antarctica, but he started his career as a Merchant Marine. Part one of this story covers his early life, early expeditions, and the treacherous start of his most famous expedition, just after WWI began.
Research:

Behind the Scenes Minis: Alaska and Contraceptives
28:17

The IUD: A History
44:41

Elizabeth Peratrovich
43:42