You've probably heard the stat about how for every dollar men make, women make just 80 cents — but there's a lot about the pay gap that might still surprise you.

April 4 marks Equal Pay Day, which represents the number of days this year women have essentially worked "for free" as the result of the wage gap. While the day is an excellent moment to raise awareness about society's inequalities, fighting for fair pay and equal rights is something you can do 365 days a year.

Students at Barnard College attend the school's 2016 commencement ceremony. Photo by Timothy A. Clary/AFP/Getty Images.

Keep Reading
More

Robin Wright knows her character's worth on 'House of Cards.' So she made a gutsy move.

The "House of Cards" star wants you to know something about her paychecks.

Is Robin Wright slowly evolving into her bold, dauntless character from "House of Cards"?

Photo by Kevin Winter/Getty Images.

Keep Reading
More