30 seconds to know

Why Women Still Don't Earn Equal Pay

WASHINGTON, DC - OCTOBER 9: A relatively diverse crowd - including Kedibone Letlaka-Rennert, C, an advisor and senior personnel manager with the International Monetary Fund - listens to Sylvia Anne Hewlett, an economist and founder and CEO of the Center for Talent Innovation, during the "Forget a Mentor, Find a Sponsor" program at the law offices of Crowell & Moring, on Wednesday, October 9, 2013, in Washington, DC. The law firm is taking part in a pilot program to openly confront unconscious bias in the workplace where they aggressively sponsor, rather than passively mentor, women and minorities and help them rise. (Photo by Jahi Chikwendiu/The Washington Post) Jahi Chikwendiu / Washington Post

On International Women's Day, MSNBC host Krystal Ball talks about the continuing fight to close the gender wage gap. About four in ten US households with kids include a mom as a primary breadwinner.

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