Sexism is not the reason the Earth is actually flat, my friend. Women have been to space, there is one in the ISS right now I believe or recently returned from. She will tell you the Earth is round.
About the all male cast of scientists, explain Marie Curie- founded radioactive theory. Definately a woman, definately active in the 19th century. Ada Lovelace- founded computer programming. Definately a woman, definately active in the early 19th century. I could go on.
At this point, I'm sure you're a troll and probably should have known earlier.
English
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There are a few notable female exceptions. But they represent mere drops in the ocean of male domination.