Students from China celebrate the dedication of the Taylor International School and dorm, where they live while attending Lake Shore High School in St. Clair, Mich. Deb Jacques/C&G Newspapers hide caption

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Kimberly Payton, a teacher at the Small Savers Child Development Center, reads to a group of preschoolers in Washington, D.C., in 2010. Researchers say that teachers who make small changes in how they read to 4-year-olds can improve kids' reading skills later on. Ricky Carioti/The Washington Post/Getty Images hide caption

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Arvind Mahankali, 12, finished third and ninth in the National Spelling Bee in the past two years, and has been stepping up his training, in hopes of finishing first this year. He's even trained his little brother, 8-year-old Srinath, to read phonetics so he can help with the drills. Tovia Smith/NPR hide caption

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Even if students have a prescription for pot, marijuana remains illegal under federal law. Colleges that let students self-medicate on campus could jeopardize their federal funding. Jeff Barnard/AP hide caption

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Domingo Williams, a participant in the Sasha Bruce Youthwork program, gathers wood to help rebuild a gutted house in the Southeast neighborhood of Washington, D.C. Emily Bogle/NPR hide caption

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A view of Earth, with shading to enhance features. Only 10 contestants remain in the 2012 National Geographic Bee. NASA hide caption

itoggle caption NASA