Therefore an American citizen who is a physicist can be recognized for her contribution to physics, but a German or French citizen cannot be.
> Other subjects may be considered if the subject had significant impact on American history, culture or environment.
What would qualify someone for that? And why would those two (Noether and Curie) not qualify?
I'd expect the qualification would be, basically, would you expect to find this person in a book of US History (and not merely as a member of a foreign power, like, say, Churchill)? I think that this is probably a reasonable "you know it when you see it" situation, but I'm sure you could find edge-cases if that was your goal.
I doubt Marie Curie would say that she had anything to do with American history.
Winston Churchill's mother is American and he is also one of 8 people in history to be granted honorary American citizenship. Therefore he is American enough that a case can be made for putting him on a US stamp.
Lafayette would, of course, qualify on his own merits because he was directly important to US history. But in addition he is another of the 8 honorary US citizens in history.
The full list of honorary citizens is at https://en.wikipedia.org/wiki/Honorary_citizenship_of_the_Un....
It is worth noting that Mother Theresa is also on that list and actually has a stamp. See https://about.usps.com/postal-bulletin/2010/pb22290/html/inf....
The only mention in the United States in Marie Curie's Wikipedia article is a brief tour she did of the US in her later years to raise money.
She was the first woman to win Nobel, (and won it twice)
(His other prize was for explaining super conductivity; he won for experimental work and separately for theoretical work!)
Bardeen didn’t bring his young children to the Nobel award ceremony the first time. The King asked him where they were and jokingly said Bardeen had ought to bring them next time. And so he did!