A physicist.[ref]
https://lise.univie.ac.at/physikerinnen/historisch/marietta-blau.htm. Independent professional profile
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Marietta Blau was an Austrian physicist known for her significant contributions to the field of nuclear and particle physics, particularly in the development of photographic emulsions used in cosmic ray research. Born on April 29, 1899, in Vienna, she became one of the first women to pursue a scientific career in a male-dominated field.