Is it co-ed?

Some take Lady Ada Lovelace as the first programmer in compuing world. She was very close with Charles Babbage who is also someitmes referred to as "Fathter of computer Science". Lady Ada Lovelace was close to writing instructions for his incomplete analyitical engine.
People say computer scientists are nerd. When somebody tries to visualize a nerd, we think of a man. An woman seldom comes to our mind, is that because of lack of female computer scientists?
In my computer science classes, the ratio between men and women is ridiculous. Most of the time, my classes don't have female students. Some big classes may have one or two. I never get a feeling that I am in a co-ed school when I am in a computer science class.