<human>: I have an opportunity to reach a rather large audience with informational posters which will replace my workplace's screensavers with a slide show reaching at least 2k machines. I have been tasked with producing this information in relatively short order... I basically get to work on this tomorrow and go live Wednesday.

Here's the deal, and why I ask. I'm not a woman, and while my mother has been active in women's clubs and other organizations she borders on the side of sensationalist liberal and mentioned many recent events which weren't really "historically significant" in my opinion. Cool/interesting stuff, but not really in the spirit of cultural significance. Sure, Gabrielle Gifford's story is interesting, but getting shot and surviving doesn't really say anything about women in history. I want to use some lesser known yet not so... overly controversial, suggestions.

There are very few rules imposed on me for the completion of this, so I want to step away from the Joan of Arc's, Harriet Tubmans, Jackie Onassis', and other frequently cited facts/figures from women in history. For instance, one person I hadn't heard about before that my wife suggested I highlight was Margaret Sanger, who was the driving force behind Planned Parenthood and birth control, which I would consider pretty damn significant contributions to society whether you agree with it or not.

Can you succinctly summarize the text in 1-3 sentences?
<bot>: Please help me, with suggestions and/or information, find some awesome and lesser-known ladies for Women's History month!