When most girls in this country get their periods, they suffer in silence. But this CNN Hero of the Year is changing the culture.

Get the Full StoryIt's something that girls and young women in western countries can't imagine: missing school, even dropping out, because of their periods. Yet as many as half the girls in rural parts of Ethiopia miss school for reasons related to their periods -- and that can have a devastating effect on their education and the rest of their lives.

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