* Flying University (Warsaw, Poland): This was an informal, underground educational institution where women were not allowed to attend official universities in Poland.
* Sorbonne University (Paris, France): This is where she obtained her degrees in Physics (1891) and Mathematics (1893).
It's important to note that Marie Skłodowska initially studied at the Flying University to gain knowledge and prepare for further studies in France. Her formal education was primarily at the Sorbonne.