Education

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Attorney General Eric Holder participates in a discussion on the importance of universal access to preschool and the need to reduce "unnecessary and unfair school discipline practices and other barriers to equity and opportunity at all levels of education" Friday, March 21, 2014, at J. Ormond Wilson Elementary School library in Washington. (AP Photo/Cliff Owen)

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**FILE** Sixth-grade math teacher Justin Kazmark mark report cards with a purple pen at P.S.188 in New York, on April 1, 2005. Kazmark is among teachers who no longer use red pens when marking homework or grading test papers, preferring to use purple. (Associated Press)

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U.S. first lady Michelle Obama, third from right, her daughters Malia, right, and Sasha, second from right, is greeted by Chinese President Xi Jinping, second from left, and his wife Peng Liyuan, left, at the Diaoyutai State guest house in Beijing, China Friday, March 21, 2014. U.S. first lady Michelle Obama met with excited students who were building robots and tried her hand at Chinese calligraphy Friday during a tour of a Beijing high school. (AP Photo/Andy Wong, Pool)

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U.S. first lady Michelle Obama, third from right, her daughters Malia, right, and Sasha, second from right, is greeted by Chinese President Xi Jinping, second from left, and his wife Peng Liyuan, left, at the Diaoyutai State guest house in Beijing, China Friday, March 21, 2014. U.S. first lady Michelle Obama met with excited students who were building robots and tried her hand at Chinese calligraphy Friday during a tour of a Beijing high school. (AP Photo/Andy Wong, Pool)

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U.S. first lady Michelle Obama, center, her daughters Malia, left, and Sasha, second from left, is accompanied by Peng Liyuan, wife of Chinese President Xi Jinping, third from right, watch students demonstrating remote control mechanical robots at the Beijing Normal School, a school that prepares students to attend universities abroad in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool)

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U.S. first lady Michelle Obama, left, tries out a remote control mechanical robot next to Peng Liyuan, wife of Chinese President Xi Jinping as they visit the Beijing Normal School, a school that prepares students to attend university abroad in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool)

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U.S. first lady Michelle Obama plays table tennis at the Beijing Normal School, a school that prepares students to attend colleges overseas in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool)

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U.S. first lady Michelle Obama, third from right, her daughters Malia, right, and Sasha, second from right, is greeted by Chinese President Xi Jinping, second from left, and his wife Peng Liyuan, left, at the Diaoyutai State guest house in Beijing, China Friday, March 21, 2014. U.S. first lady Michelle Obama met with excited students who were building robots and tried her hand at Chinese calligraphy Friday during a tour of a Beijing high school. (AP Photo/Andy Wong, Pool)

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Peng Liyuan, wife of Chinese President Xi Jinping, left, shows U.S. first lady Michelle Obama, center, how to hold a writing brush as they visit a Chinese traditional calligraphy class at the Beijing Normal School, a school that prepares students to go abroad in Beijing, China Friday, March 21, 2014. (AP Photo/Andy Wong, Pool)