I haven’t gotten around to reading more about Jack Kirby’s life (Mark Evanier’s book is on my to-read list), so I found this article by Roy Schwartz about how much of Kirby’s life went into Captain America intriguing.
For example, I didn’t know much, if anything, about Kirby’s service in World War II, something that I’d be interested in learning about all the comic creators of that era (similar to what was covered with the book and later TV series, Five Came Back). I’m sure he wasn’t the only one shaped by the conflict.