A lot of the stories that are told about popcorn in history – particularly in North America – are incorrect. Popcorn has been around for a very long time, though its rise to popularity as a snack has accelerated in recent years.
Research:

Dorothy Crowfoot Hodgkin’s Crystalline Chemistry, Part 1
38:04

SYMHC Classics: Sarah Bradlee Fulton
32:28

Behind the Scenes Minis: Stairs and Trains
29:25