That is a very interesting thing to think about. I don't understand it either. Maybe in male chauvinist countries is understandable the low ratio situation due to discrimination. But here in USA(where I live), it is weird to still see that huge difference in numbers. In my classes like 90% are men. I have no clue about why it is like that in first-world countries as well. Speaking of NASA, it reminded me of one of my favorite movies that touches on this subject from gender/racial perspective: Hidden Figures.
I feel like it used to be a "women's job" due to it being a backend war job, just how men used to go to the frontlines and women and children would work the factories making ammunition and supplies.
Then, in peaceful times, women chose less misanthropic pursuits than STEM.
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