Reason: None provided.
Again... the Mercury Thirteen experiment was a thing eight months before the book hit shelves.
The experiment was flawed, but it was still a thing that happened; it's reasonable to assume that Heinlein knew about it and was influenced by its (flawed) outcome.
2 years ago
1 score
Reason: Original
Again... the Mercury Thirteen experiment was a thing half a year before the book hit shelves.
2 years ago
1 score