Where were the girls?

I recently read a story of the rage unleashed upon a woman who moved NASA tank tops from the boys' section to the girls' in a big box store (see link below). It's not surprising that there's still a stigma attached to gender. There's a gender pay gap for identical job titles and responsibilities.Women/girls are usually prohibited from competing against boys athletically. And many people disliked Hillary Clinton because she was "outspoken" and "pushy," qualities admired in male presidents.

Because I recently attended my high school reunion and have renewed friendships from long ago I began to wonder about the overt and subtle prohibitions that girls faced years ago. It was brutal enough going to Catholic school for 12 years but were there other restrictions in play? How did they manifest themselves? For example, up through 8th grade we were in one room so we all learned the same lessons. Once in high school, classes were by subject. In Freshman and Sophomore years, there were an equal number of boys and girls in math and science classes. By Senior year there weren't any girls in math classes nor in Physics, that I can recall. Why was that? It certainly had nothing to do with intelligence. How did that happen?

http://www.womenyoushouldknow.net/because-i-moved-5-shirts-portrait-of-an-unexpected-twitter-storm/