Why do people always omit the "Skłodowska" part? She has used her maiden name through all her life and always identified with her Polish origins, so it might be a little bit disrespectful. There simply are too many signs that she would want to be remembered as Marie Skłodowska-Curie, not just Marie Curie.
In my case I plead ignorance. I grew up knowing her as Marie Curie and not as Marie Skłodowska-Curie. Who does one pronounce Skłodowska?
imagine yourself having fun with your ignorance of some jewish scientist, it's exactly the same problem, even though more Poles died during WWII than jews