Palo Alto High School teacher Esther Wojcicki helps student Allison Wyndham at a computer during class. George Nikitin/AP hide caption

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Nkomo Morris, a teacher at Brooklyn's Art and Media High School, works on her classroom computer in New York. Bebeto Matthews/AP hide caption

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Mariah Arostigue (left) and Noah Reyes, 11th-graders, chat as they work on their homework in a pre-calculus class at Segerstrom High School in Santa Ana, Calif. Jae C. Hong/AP hide caption

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Twitter announced its partnership with Vine, a video-sharing app that posts six-second videos onto a tweet, on Thursday, Jan. 24. Marie McGrory/NPR hide caption

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