Interesting factoid: at one meeting of 24 people for the Manhattan Project, there were 13 nationalities represented by the participants.pic.twitter.com/JEVr7VjH9I
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That gets me up to 12. Curious about the 13th! Maybe one of the Commonwealth countries.
Romania? Had substantial Hungarian & ethnic German populations after 1918.
I'd also add Ukraine (Galicia) & Yugoslavia to list of possibles for similar reasons.
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